DeCS 
    2008 - March 17, 2008 version
    
       
        |  Alphabetic 
          Index of Descriptors   
           
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        |  | 
 | M Locus use Minor Lymphocyte Stimulatory Loci | 
| M Phase use Cell Division | 
| M Phase, Meiotic use Meiosis | 
| M Phase-Promoting Factor use Maturation-Promoting Factor | 
| M'Naghten Rule use Insanity Defense | 
| M-CSF use Macrophage Colony-Stimulating Factor | 
| M13 Phage use Bacteriophage M13 | 
| MACIF use Antigens, CD59 | 
| MADS Domain Proteins | 
| MAG Protein use Myelin-Associated Glycoprotein | 
| MAIC use Mycobacterium avium Complex | 
| MAIDS use Murine Acquired Immunodeficiency Syndrome | 
| MALD-MS use Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization | 
| MALDI use Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization | 
| MALT Lymphoma use Lymphoma, B-Cell, Marginal Zone | 
| MAO use Monoamine Oxidase | 
| MAO Inhibitors use Monoamine Oxidase Inhibitors | 
| MAP Kinase 2 use Mitogen-Activated Protein Kinase 1 | 
| MAP Kinase Cascade use MAP Kinase Signaling System | 
| MAP Kinase Kinase 1 | 
| MAP Kinase Kinase 2 | 
| MAP Kinase Kinase 3 | 
| MAP Kinase Kinase 4 | 
| MAP Kinase Kinase 5 | 
| MAP Kinase Kinase 6 | 
| MAP Kinase Kinase 7 | 
| MAP Kinase Kinase Kinase 1 | 
| MAP Kinase Kinase Kinase 2 | 
| MAP Kinase Kinase Kinase 3 | 
| MAP Kinase Kinase Kinase 4 | 
| MAP Kinase Kinase Kinase 5 | 
| MAP Kinase Kinase Kinases | 
| MAP Kinase Kinases use Mitogen-Activated Protein Kinase Kinases | 
| MAP Kinase Signaling Pathways use MAP Kinase Signaling System | 
| MAP Kinase Signaling System | 
| MAP Kinases, Extracellular Signal-Regulated use Extracellular Signal-Regulated MAP Kinases | 
| MAP-Kinase-Activated Kinase 1 use Ribosomal Protein S6 Kinases, 90-kDa | 
| MAP-Kinase-Activated Protein Kinase 1 use Ribosomal Protein S6 Kinases, 90-kDa | 
| MAPK Kinases use Mitogen-Activated Protein Kinase Kinases | 
| MAPK-ERK Kinase Kinases use MAP Kinase Kinase Kinases | 
| MAPK-ERK Kinases use Mitogen-Activated Protein Kinase Kinases | 
| MAPKKKs use MAP Kinase Kinase Kinases | 
| MAPKKs use Mitogen-Activated Protein Kinase Kinases | 
| MAR/SAR Recognition Signature Sequence use Matrix Attachment Regions | 
| MCF Viruses use Mink Cell Focus-Inducing Viruses | 
| MCLS use Mucocutaneous Lymph Node Syndrome | 
| MCM1 Protein | 
| MCPA use 2-Methyl-4-chlorophenoxyacetic Acid | 
| MD-2 Protein use Lymphocyte Antigen 96 | 
| MDG1 Retrotransposons use Retroelements | 
| MDMA use N-Methyl-3,4-methylenedioxyamphetamine | 
| MDR Genes use Genes, MDR | 
| MDR1 Protein use P-Glycoprotein | 
| MECC use Chromatography, Micellar Electrokinetic Capillary | 
| MEDICARE Prescription Drug Improvement and Modernization Act of 2003 use Medication Therapy Management | 
| MEDLARS | 
| MEDLINE | 
| MEDPAC use Medicare Payment Advisory Commission | 
| MEK Kinases use MAP Kinase Kinase Kinases | 
| MEKC use Chromatography, Micellar Electrokinetic Capillary | 
| MEKKs use MAP Kinase Kinase Kinases | 
| MEKs use Mitogen-Activated Protein Kinase Kinases | 
| MELAS Syndrome | 
| MEN 1 use Multiple Endocrine Neoplasia Type 1 | 
| MEN 2 use Multiple Endocrine Neoplasia Type 2a | 
| MEN 2a use Multiple Endocrine Neoplasia Type 2a | 
| MEN 2b use Multiple Endocrine Neoplasia Type 2b | 
| MEN 3 use Multiple Endocrine Neoplasia Type 2b | 
| MERRF Syndrome | 
| MGI-1 use Colony-Stimulating Factors | 
| MGI-2 use Interleukin-6 | 
| MHC Class I Genes use Genes, MHC Class I | 
| MHC Class II Genes use Genes, MHC Class II | 
| MHPE use 3-Methoxy-4-hydroxyphenylethanol | 
| MHPG use Methoxyhydroxyphenylglycol | 
| MIB-1 Antigen use Ki-67 Antigen | 
| MIBG use 3-Iodobenzylguanidine | 
| MIL-RAF Proteins use raf Kinases | 
| MMPI | 
| MMPs use Matrix Metalloproteinases | 
| MMR Vaccine use Measles-Mumps-Rubella Vaccine | 
| MN Sialoglycoprotein use Glycophorin | 
| MNSs Blood-Group System | 
| MODS use Multiple Organ Failure | 
| MODY use Diabetes Mellitus, Type 2 | 
| MOPEG use Methoxyhydroxyphenylglycol | 
| MOPET use 3-Methoxy-4-hydroxyphenylethanol | 
| MPGN use Glomerulonephritis, Membranoproliferative | 
| MPN use Multiple Tube Method | 
| MPN Technique use Multiple Tube Method | 
| MPTP use 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine | 
| MPTP Neurotoxicity Syndrome use MPTP Poisoning | 
| MPTP Poisoning | 
| MR Guided Interventional Procedures use Magnetic Resonance Imaging, Interventional | 
| MR Spectroscopy use Magnetic Resonance Spectroscopy | 
| MR Tomography use Magnetic Resonance Imaging | 
| MR Tomography, Echo-Planar use Echo-Planar Imaging | 
| MRI Angiography use Magnetic Resonance Angiography | 
| MRI Scans use Magnetic Resonance Imaging | 
| MRI, Functional use Magnetic Resonance Imaging | 
| MRI, Interventional use Magnetic Resonance Imaging, Interventional | 
| MRS Sequence use Matrix Attachment Regions | 
| MS (Multiple Sclerosis) use Multiple Sclerosis | 
| MS2 Phage use Levivirus | 
| MSG use Sodium Glutamate | 
| MSH use Melanocyte-Stimulating Hormones | 
| MSH Release-Inhibiting Factor use MSH Release-Inhibiting Hormone | 
| MSH Release-Inhibiting Hormone | 
| MSH, alpha use alpha-MSH | 
| MSP1 use Merozoite Surface Protein 1 | 
| MSX1 Transcription Factor | 
| MT use Megaton | 
| MTS1 Genes use Genes, p16 | 
| Ma huang use Ephedra sinica | 
| Maackia | 
| Mac-1 Antigen use Macrophage-1 Antigen | 
| Mac-2 Antigen use Galectin 3 | 
| MacLeod Syndrome use Lung, Hyperlucent | 
| Maca use Lepidium | 
| Macaca | 
| Macaca fascicularis | 
| Macaca mulatta | 
| Macaca nemestrina | 
| Macaca radiata | 
| Macadamia | 
| Macao | 
| Macaque use Macaca | 
| Macaque Simian Foamy Virus use Spumavirus | 
| Macaranga use Euphorbiaceae | 
| Macaroni use Pastas | 
| Macedonia (Greece) use Greece | 
| Macedonia (Republic) | 
| Macedonia (Yugoslavia) use Macedonia (Republic) | 
| Machado-Joseph Disease | 
| Machaerium use Fabaceae | 
| Machiavellianism | 
| Machine Intelligence use Artificial Intelligence | 
| Machine Learning use Artificial Intelligence | 
| Machinery | 
| Machlomovirus use Tombusviridae | 
| Machupo virus use Arenaviruses, New World | 
| Maclura | 
| Macluravirus use Potyviridae | 
| Macrobiotics use Diet, Macrobiotic | 
| Macrobrachium use Palaemonidae | 
| Macrocyclic Compounds | 
| Macrocyclic Lactams use Lactams, Macrocyclic | 
| Macrocystis | 
| Macroglobulinemia use Waldenstrom Macroglobulinemia | 
| Macroglobulins | 
| Macroglossia | 
| Macrogols use Polyethylene Glycols | 
| Macrolides | 
| Macromeasurers use Water and Sewerage System Accessories | 
| Macromesurement use Flow Measurements | 
| Macromolecular Substances | 
| Macronucleus | 
| Macronutrients | 
| Macrophage Activation | 
| Macrophage Colony-Stimulating Factor | 
| Macrophage Inflammatory Proteins | 
| Macrophage Migration Test use Cell Migration Assays, Macrophage | 
| Macrophage Migration-Inhibitory Factors | 
| Macrophage Scavenger Receptors use Receptors, Scavenger | 
| Macrophage-1 Antigen | 
| Macrophage-Activating Factors | 
| Macrophage-Granulocyte Inducer use Colony-Stimulating Factors | 
| Macrophages | 
| Macrophages, Alveolar | 
| Macrophages, Peritoneal | 
| Macrophages, Pulmonary use Macrophages, Alveolar | 
| Macrophyton | 
| Macropodidae | 
| Macropsia use Vision Disorders | 
| Macropus use Macropodidae | 
| Macroseismic Intensity use Intensity, Macroseismic | 
| Macrosomia, Fetal use Fetal Macrosomia | 
| Macrostomia | 
| Macrotinum | 
| Macrotys racemosa use Cimicifuga racemosa | 
| Macrozamia spiralis | 
| Macula Lutea | 
| Maculae, Acoustic use Acoustic Maculae | 
| Macular Degeneration | 
| Macular Dystrophy, Corneal use Corneal Dystrophies, Hereditary | 
| Macular Edema | 
| Macular Edema, Cystoid use Macular Edema | 
| Macular Holes use Retinal Perforations | 
| Maculopapular Cutaneous Mastocytosis use Urticaria Pigmentosa | 
| Maculopathy, Age-Related use Macular Degeneration | 
| Mad Cow Disease use Encephalopathy, Bovine Spongiform | 
| Madagascar | 
| Madar use Calotropis gigantea | 
| Madeira Island use Portugal | 
| Madelung Disease use Lipomatosis, Multiple Symmetrical | 
| Madhuca | 
| Madoera use Indonesia | 
| Madura Foot use Maduromycosis | 
| Madurella | 
| Maduromycosis | 
| Maedi use Pneumonia, Progressive Interstitial, of Sheep | 
| Maedi Virus use Visna-maedi virus | 
| Maedi-Visna Virus use Visna-maedi virus | 
| Maesa use Myrsinaceae | 
| Maf Transcription Factors | 
| Maf Transcription Factors, Large | 
| Maf Transcription Factors, Small | 
| MafB Proteins use MafB Transcription Factor | 
| MafB Transcription Factor | 
| MafF Transcription Factor | 
| MafG Transcription Factor | 
| MafK Transcription Factor | 
| Mafenide | 
| Maffucci Syndrome use Enchondromatosis | 
| Magainins | 
| Magentas use Rosaniline Dyes | 
| Maggot Infestations use Myiasis | 
| Maggots use Larva | 
| Maghreb use Africa, Northern | 
| Magic | 
| Magma | 
| Magma Intrusion use Magmatic Intrusion | 
| Magmatic Intrusion | 
| Magnaporthe | 
| Magnesia Borocitrica | 
| Magnesia Carbonica | 
| Magnesia Fluorata | 
| Magnesia Iodata | 
| Magnesia Muriatica | 
| Magnesia Phosphorica | 
| Magnesia Sulphurica | 
| Magnesia Usta | 
| Magnesium | 
| Magnesium ADP use Adenosine Diphosphate | 
| Magnesium ATPase use Ca(2+) Mg(2+)-ATPase | 
| Magnesium Adenosinetriphosphatase use Ca(2+) Mg(2+)-ATPase | 
| Magnesium Calcium Carbonate | 
| Magnesium Chloride | 
| Magnesium Compounds | 
| Magnesium Deficiency | 
| Magnesium Hydroxide | 
| Magnesium Muriaticum use Magnesia Muriatica | 
| Magnesium Oxide | 
| Magnesium Silicates | 
| Magnesium Sulfate | 
| Magnesium Sulphuricum use Magnesia Sulphurica | 
| Magnetic Resonance use Magnetic Resonance Spectroscopy | 
| Magnetic Resonance Angiography | 
| Magnetic Resonance Cholangiopancreatography use Cholangiopancreatography, Magnetic Resonance | 
| Magnetic Resonance Imaging | 
| Magnetic Resonance Imaging, Cine | 
| Magnetic Resonance Imaging, Diffusion use Diffusion Magnetic Resonance Imaging | 
| Magnetic Resonance Imaging, Echo-Planar use Echo-Planar Imaging | 
| Magnetic Resonance Imaging, Functional use Magnetic Resonance Imaging | 
| Magnetic Resonance Imaging, Interventional | 
| Magnetic Resonance Spectroscopy | 
| Magnetic Segregation | 
| Magnetics | 
| Magnetis Polus Ambo | 
| Magnetis Polus Arcticus | 
| Magnetis Polus Australis | 
| Magnetization Transfer Contrast Imaging use Magnetic Resonance Imaging | 
| Magnetocardiography | 
| Magnetoencephalography | 
| Magnetometry use Magnetics | 
| Magnetospirillum | 
| Magnetotherapy use Alternative Therapies | 
| Magnitude use Richter Scale | 
| Magnolia | 
| Magnolia glauca | 
| Magnolia grandiflora | 
| Magnoliaceae | 
| Magnoliophyta use Angiosperms | 
| Maguey use Agave | 
| Mahaim-Type Pre-Excitation use Pre-Excitation, Mahaim-Type | 
| Mahogany, Mountain use Rosaceae | 
| Mahonia | 
| Maidenhair Tree use Ginkgo biloba | 
| Maillard Reaction | 
| Maine | 
| Mainland China use China | 
| Mainstreaming (Education) | 
| Maintenance | 
| Maintenance and Engineering, Hospital | 
| Maitansine use Maytansine | 
| Maize use Zea mays | 
| Maize Chlorotic Dwarf Virus use Waikavirus | 
| Maize Oil use Corn Oil | 
| Maize streak virus | 
| Majewski Syndrome use Short Rib-Polydactyly Syndrome | 
| Major Basic Protein, Eosinophil use Eosinophil Major Basic Protein | 
| Major Core Protein use Viral Core Proteins | 
| Major Core Proteins, Viral use Viral Core Proteins | 
| Major Depressive Disorder use Depressive Disorder, Major | 
| Major Histocompatibility Complex | 
| Major Motor Seizure Disorder use Epilepsy, Tonic-Clonic | 
| Majorana hortensis use Origanum | 
| Malabar-nut use Adhatoda | 
| Malabsorption Syndromes | 
| Malacoplakia | 
| Malagasy Republic use Madagascar | 
| Malandrinum | 
| Malar Bone use Zygoma | 
| Malaria | 
| Malaria Meningitis use Malaria, Cerebral | 
| Malaria Officinalis | 
| Malaria Vaccines | 
| Malaria, Avian | 
| Malaria, Cerebral | 
| Malaria, Falciparum | 
| Malaria, Hemolytic use Blackwater Fever | 
| Malaria, Vivax | 
| Malariatoxinum | 
| Malassezia | 
| Malate Condensing Enzyme use Malate Synthase | 
| Malate Dehydrogenase | 
| Malate Dehydrogenase (NADP+) | 
| Malate Synthase | 
| Malate Synthetase use Malate Synthase | 
| Malates | 
| Malathion | 
| Malawi | 
| Malay Archipelago use Indonesia | 
| Malay Federation use Malaysia | 
| Malay Peninsula use Malaysia | 
| Malaya use Malaysia | 
| Malaya Federation use Malaysia | 
| Malaysia | 
| Maldives use Indian Ocean Islands | 
| Male | 
| Male Breast Neoplasms use Breast Neoplasms, Male | 
| Male Fern use Dryopteris | 
| Male Genital Diseases use Genital Diseases, Male | 
| Male Genital Neoplasms use Genital Neoplasms, Male | 
| Male Genital Tuberculosis use Tuberculosis, Male Genital | 
| Male Pattern Baldness use Alopecia | 
| Male Urogenital Diseases | 
| Maleates | 
| Maleic Acid Hydrazide use Maleic Hydrazide | 
| Maleic Anhydride Divinyl Ether use Pyran Copolymer | 
| Maleic Anhydride Vinyl Ether use Pyran Copolymer | 
| Maleic Anhydrides | 
| Maleic Hydrazide | 
| Maleimides | 
| Malformations of Cortical Development | 
| Malfunction, Equipment use Equipment Failure | 
| Mali | 
| Malic Acid use Malicum Acidum | 
| Malicum Acidum | 
| Malignancies, Post-Traumatic use Neoplasms, Post-Traumatic | 
| Malignant Astrocytoma, Optic Nerve use Optic Nerve Glioma | 
| Malignant Atrophic Papulosis | 
| Malignant Carcinoid Syndrome | 
| Malignant Catarrh | 
| Malignant Cerebellar Neoplasms use Cerebellar Neoplasms | 
| Malignant Fibrous Histiocytoma use Histiocytoma, Malignant Fibrous | 
| Malignant Histiocytosis use Histiocytic Sarcoma | 
| Malignant Hyperpyrexia use Malignant Hyperthermia | 
| Malignant Hyperthermia | 
| Malignant Melanoma use Melanoma | 
| Malignant Meningioma use Meningioma | 
| Malignant Peripheral Nerve Sheath Tumors use Nerve Sheath Neoplasms | 
| Malignant Primary Brain Tumors use Brain Neoplasms | 
| Malingering | 
| Malleinum use Hippozaeninum | 
| Mallet Toe use Hammer Toe Syndrome | 
| Malleus | 
| Mallophaga | 
| Mallory-Weiss Syndrome | 
| Mallotus Plant | 
| Mallow, Marsh use Althaea | 
| Malmea depressa use Guatteria gaumeri | 
| Malnutrition | 
| Malnutrition, Fetal use Fetal Nutrition Disorders | 
| Malnutrition, Infant use Infant Nutrition Disorders | 
| Malocclusion | 
| Malocclusion, Angle Class I | 
| Malocclusion, Angle Class II | 
| Malocclusion, Angle Class III | 
| Malonaldehyde use Malondialdehyde | 
| Malonate-Semialdehyde Dehydrogenase (Acetylating) | 
| Malonates | 
| Malondialdehyde | 
| Malonyl CoA use Malonyl Coenzyme A | 
| Malonyl Coenzyme A | 
| Malpighiaceae | 
| Malpighian Tubules | 
| Malpractice | 
| Malt use Cereals | 
| Malta | 
| Malta Fever use Brucellosis | 
| Maltases use alpha-Glucosidases | 
| Malthusianism use Population Dynamics | 
| Maltose | 
| Malus | 
| Malva | 
| Malvaceae | 
| Malvinas use Falkland Islands | 
| Mamastrovirus | 
| Mamba use Elapidae | 
| Mamillary Bodies | 
| Mammae use Mammary Glands, Animal | 
| Mammalian Artificial Chromosomes use Chromosomes, Artificial, Mammalian | 
| Mammalian Orthoreovirus 1 use Orthoreovirus, Mammalian | 
| Mammalian Orthoreovirus 2 use Orthoreovirus, Mammalian | 
| Mammalian Type B Retroviruses use Betaretrovirus | 
| Mammalian Type C Retroviruses use Gammaretrovirus | 
| Mammalian orthoreovirus use Orthoreovirus, Mammalian | 
| Mammalian orthoreovirus 3 | 
| Mammals | 
| Mammaplasty | 
| Mammary Arteries | 
| Mammary Cancer Virus use Mammary Tumor Virus, Mouse | 
| Mammary Dysplasia use Fibrocystic Breast Disease | 
| Mammary Glands, Animal | 
| Mammary Glands, Human | 
| Mammary Neoplasms, Animal | 
| Mammary Neoplasms, Experimental | 
| Mammary Tumor Virus, Mouse | 
| Mammea | 
| Mammillary Bodies use Mamillary Bodies | 
| Mammography | 
| Mammography, Ultrasonic use Ultrasonography, Mammary | 
| Mammotropic Hormone, Pituitary use Prolactin | 
| Mammotropic Hormone, Placental use Placental Lactogen | 
| Mammotropin use Prolactin | 
| Man (Taxonomy) use Humans | 
| Man-Machine Systems | 
| Man-Made Disasters | 
| Manaca use Franciscaea uniflora | 
| Managed Care Programs | 
| Managed Competition | 
| Managed Health Care Insurance Plans use Managed Care Programs | 
| Management | 
| Management Audit | 
| Management Capacity use Health Management | 
| Management Case Studies use Organizational Case Studies | 
| Management Indicators | 
| Management Information Systems | 
| Management Quality Circles | 
| Management Service Organizations | 
| Management Teams, Institutional use Institutional Management Teams | 
| Management of Natural Resources use Natural Resources Management | 
| Manatee, Amazon use Trichechus inunguis | 
| Manatee, Brazilian use Trichechus inunguis | 
| Manatee, Caribbean use Trichechus manatus | 
| Manatee, Florida use Trichechus manatus | 
| Manatee, West Indian use Trichechus manatus | 
| Manatees use Trichechus | 
| Manchineel use Hippomane | 
| Manchuria use China | 
| Mancinella | 
| Mandarivirus use Flexiviridae | 
| Mandate Refugee | 
| Mandatory Programs | 
| Mandatory Reporting | 
| Mandatory Screening use Mandatory Testing | 
| Mandatory Testing | 
| Mandelic Acids | 
| Mandelonitrile-beta-Gentiobioside use Amygdalin | 
| Mandible | 
| Mandibular Advancement | 
| Mandibular Condyle | 
| Mandibular Diseases | 
| Mandibular Fractures | 
| Mandibular Injuries | 
| Mandibular Neoplasms | 
| Mandibular Nerve | 
| Mandibular Prosthesis | 
| Mandibular Prosthesis Implantation | 
| Mandibular Rest Position use Vertical Dimension | 
| Mandibular Ridge Augmentation use Alveolar Ridge Augmentation | 
| Mandibulofacial Dysostosis | 
| Mandragora | 
| Mandragora officinarum | 
| Mandrake, American use Podophyllum peltatum | 
| Mandrake, European use Mandragora | 
| Mandrill use Mandrillus | 
| Mandrillus | 
| Manduca | 
| Manduca sexta use Manduca | 
| Mandukaparni use Centella | 
| Maneb | 
| Mangabey, Sooty use Cercocebus atys | 
| Mangabeys use Cercocebus | 
| Mangal use Mangrove Swamps | 
| Manganese | 
| Manganese Adenosine Triphosphate use Adenosine Triphosphate | 
| Manganese Compounds | 
| Manganese Disease | 
| Manganese Poisoning | 
| Manganum Aceticum | 
| Manganum Colloidale | 
| Manganum Muriaticum | 
| Manganum Oxydatum use Manganum Oxydatum Nativum | 
| Manganum Oxydatum Nativum | 
| Manganum Sulphuricum | 
| Mange use Mite Infestations | 
| Mange, Sarcoptic use Scabies | 
| Mangifera | 
| Mangifera indica | 
| Mango use Mangifera | 
| Mangosteen use Garcinia mangostana | 
| Mangrove (Swamps) use Mangrove Swamps | 
| Mangrove Swamp Forest use Mangrove Swamps | 
| Mangrove Swamps | 
| Mangrove, American use Rhizophoraceae | 
| Mangrove, Grey use Avicennia | 
| Mangrove, Red use Rhizophoraceae | 
| Manic Disorder use Bipolar Disorder | 
| Manic-Depressive Psychosis use Bipolar Disorder | 
| Manifest Anxiety Scale | 
| Manihot | 
| Manihot utilissima use Cassada | 
| Manikins | 
| Manilkara | 
| Manioc use Manihot | 
| Manipulation Therapy use Musculoskeletal Manipulations | 
| Manipulation, Chiropractic | 
| Manipulation, Orthopedic | 
| Manipulation, Osteopathic | 
| Manipulation, Psychological use Machiavellianism | 
| Manipulation, Spinal | 
| Manipulations, Musculoskeletal use Musculoskeletal Manipulations | 
| Manitoba | 
| Manjack use Cordia | 
| Mann-Whitney U Test use Statistics, Nonparametric | 
| Mannan-Binding Lectin Complement Pathway use Complement Pathway, Mannose-Binding Lectin | 
| Mannans | 
| Mannequins use Manikins | 
| Mannheimia | 
| Mannheimia haemolytica | 
| Mannich Bases | 
| Mannitol | 
| Mannitol Dehydrogenase use Mannitol Dehydrogenases | 
| Mannitol Dehydrogenases | 
| Mannitol Nitrogen Mustard use Mannomustine | 
| Mannitol Phosphates | 
| Mannoheptulose | 
| Mannoketoheptose use Mannoheptulose | 
| Mannolipid use Dolichol Monophosphate Mannose | 
| Mannomustine | 
| Mannonate Oxidoreductase use Fructuronate Reductase | 
| Mannose | 
| Mannose-6-Phosphate Isomerase | 
| Mannose-Binding Lectin | 
| Mannose-Binding Lectin Complement Pathway use Complement Pathway, Mannose-Binding Lectin | 
| Mannose-Binding Lectins | 
| Mannose-Binding Protein-Associated Serine Proteases | 
| Mannosephosphate Isomerase use Mannose-6-Phosphate Isomerase | 
| Mannosephosphates | 
| Mannosidase Deficiency Diseases | 
| Mannosidases | 
| Mannosides | 
| Mannosidosis use Mannosidase Deficiency Diseases | 
| Mannosidosis, alpha B, Lysosomal use alpha-Mannosidosis | 
| Mannosidosis, beta A, Lysosomal use beta-Mannosidosis | 
| Mannosyl Phosphoryl Dolichol use Dolichol Monophosphate Mannose | 
| Mannosyl-Glycoprotein Endo-beta-N-Acetylglucosaminidase | 
| Mannosyltransferases | 
| Manometry | 
| Mansonella | 
| Mansonella ozzardi use Mansonella | 
| Mansonelliasis | 
| Mansonia use Sterculiaceae | 
| Mantidae use Mantodea | 
| Mantids use Mantodea | 
| Mantle-Cell Lymphoma use Lymphoma, Mantle-Cell | 
| Mantle-Zone Lymphoma use Lymphoma, Mantle-Cell | 
| Mantodea | 
| Manual Communication | 
| Manual Segregation | 
| Manual Sweeping | 
| Manuals and Guidelines for Research Management | 
| Manuals as Topic | 
| Manubrium | 
| Manufactured Materials | 
| Manuka, New Zealand use Leptospermum | 
| Manure | 
| Manuscripts | 
| Manuscripts as Topic | 
| Manuscripts, Medical | 
| Many-Toothed Blackfish use Dolphins | 
| Manzanita | 
| Mapato use Ratanhia peruviana | 
| Maple Syrup Urine Disease | 
| Mappine use Bufotenin | 
| Maprotiline | 
| Maprounea use Euphorbiaceae | 
| Maps | 
| Maps as Topic | 
| Maranta use Marantaceae | 
| Marantaceae | 
| Marasmus use Protein-Energy Malnutrition | 
| Marasmus (Public Health) | 
| Marble Bone Disease use Osteopetrosis | 
| Marble spleen disease virus use Siadenovirus | 
| Marburg Virus Disease | 
| Marburgvirus | 
| Marcela use Achyrocline | 
| Marchantia | 
| Marchiafava-Bignami Disease | 
| Marcus-Gunn Pupil use Pupil Disorders | 
| Mardivirus | 
| Marek Disease | 
| Marek Disease Vaccines | 
| Marek Disease-Like Viruses use Mardivirus | 
| Marek's Disease use Marek Disease | 
| Marek's Disease Herpesvirus 1 use Herpesvirus 2, Gallid | 
| Marek's Disease Herpesvirus 2 use Herpesvirus 3, Gallid | 
| Marek's Disease Virus Serotype 1 use Herpesvirus 2, Gallid | 
| Marek's Disease Virus Serotype 2 use Herpesvirus 3, Gallid | 
| Marek's Disease Virus Serotype 3 use Herpesvirus 1, Meleagrid | 
| Marfan Syndrome | 
| Margarine | 
| Margin | 
| Marginal Adaptation (Dentistry) | 
| Marginal Ulcer use Peptic Ulcer | 
| Marginal Zone B-Cell Lymphoma use Lymphoma, B-Cell, Marginal Zone | 
| Mariana Islands use Micronesia | 
| Marie Cerebellar Ataxia use Spinocerebellar Degenerations | 
| Marie-Bamberger Disease use Osteoarthropathy, Secondary Hypertrophic | 
| Marie-Struempell Disease use Spondylitis, Ankylosing | 
| Marijuana use Cannabis | 
| Marijuana Abuse | 
| Marijuana Dependence use Marijuana Abuse | 
| Marijuana Smoking | 
| Marine Abyss use Seabottom | 
| Marine Animals use Marine Fauna | 
| Marine Biology | 
| Marine Conservation Area | 
| Marine Currents | 
| Marine Dolphins use Dolphins | 
| Marine Environment | 
| Marine Fauna | 
| Marine Flora | 
| Marine Intrusion | 
| Marine Plants use Marine Flora | 
| Marine Pollution use Sea Water Pollution | 
| Marine Resources | 
| Marine Sediments (Environmental Health) | 
| Marine Storm | 
| Marine Toxins | 
| Marine and Terrestrial Jurisdiction | 
| Marine and Terrestrial Protected Areas use Marine and Terrestrial Jurisdiction | 
| Marines use Military Personnel | 
| Marinesco-Sjogren Syndrome use Spinocerebellar Degenerations | 
| Marinobacter | 
| Marinomonas | 
| Marital Conflict use Family Conflict | 
| Marital Relationship use Marriage | 
| Marital Status | 
| Marital Therapy | 
| Maritime Climate | 
| Maritime Constructions | 
| Maritime Rights | 
| Maritime and Terrestrial Jurisdiction use Marine and Terrestrial Jurisdiction | 
| Marjoram use Origanum | 
| Marjoram Plant use Origanum | 
| Marker Antigens use Antigens, Differentiation | 
| Marker Vaccines use Vaccines, Marker | 
| Markers, Biochemical use Biological Markers | 
| Markers, Biological use Biological Markers | 
| Markers, Clinical use Biological Markers | 
| Markers, DNA use Genetic Markers | 
| Markers, Genetic use Genetic Markers | 
| Markers, Immunologic use Biological Markers | 
| Markers, Laboratory use Biological Markers | 
| Markers, Serum use Biological Markers | 
| Markers, Surrogate use Biological Markers | 
| Markers, Tumor use Tumor Markers, Biological | 
| Markers, Viral use Biological Markers | 
| Market Sanitation | 
| Marketing | 
| Marketing of Health Services | 
| Markov Chains | 
| Markov Process use Markov Chains | 
| Marlberry use Ardisia | 
| Marmoset Virus use Simplexvirus | 
| Marmoset, Common use Callithrix | 
| Marmoset, Cotton-Top use Saguinus | 
| Marmoset, Long-Tusked use Saguinus | 
| Marmoset, Short-Tusked use Callithrix | 
| Marmosets use Callithrix | 
| Marmosets, Goeldi's use Callimico | 
| Marmota | 
| Maroteaux-Lamy Syndrome use Mucopolysaccharidosis VI | 
| Marriage | 
| Marriage Rate | 
| Marriage Therapy use Marital Therapy | 
| Married Persons use Spouses | 
| Marrow use Bone Marrow | 
| Marrubium | 
| Marrubium album | 
| Mars | 
| Marsdenia | 
| Marsh Fever use Malaria | 
| Marshall Islands use Micronesia | 
| Marshes use Mangrove Swamps | 
| Marshmallow use Althaea | 
| Marsilea use Marsileaceae | 
| Marsileaceae | 
| Marsupialia | 
| Martens use Mustelidae | 
| Martes use Mustelidae | 
| Martes zibellina use Mustelidae | 
| Martial Arts | 
| Martin-Bell Syndrome use Fragile X Syndrome | 
| Martinique | 
| Marula use Anacardiaceae | 
| Marum verum use Teucrium marum verum | 
| Marxism use Communism | 
| Maryland | 
| Maryland Bridge use Denture, Partial, Fixed, Resin-Bonded | 
| Masers use Lasers | 
| Masked Messenger RNA use RNA, Messenger, Stored | 
| Masking, Perceptual use Perceptual Masking | 
| Masks | 
| Masochism | 
| Mason-Pfizer monkey virus | 
| Masonry | 
| Mass Behavior | 
| Mass Casualty Incidents | 
| Mass Casualty Management | 
| Mass Chest X-Ray | 
| Mass Extinction use Extinction, Biological | 
| Mass Immunization | 
| Mass Media | 
| Mass Screening | 
| Mass Spectrometry | 
| Mass Spectrometry, Fast Atom Bombardment use Spectrometry, Mass, Fast Atom Bombardment | 
| Mass Spectrometry, Matrix-Assisted Laser Desorption-Ionization use Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization | 
| Mass Spectrometry, Secondary Ion use Spectrometry, Mass, Secondary Ion | 
| Mass Spectroscopy use Mass Spectrometry | 
| Mass Spectroscopy, Fast Atom Bombardment use Spectrometry, Mass, Fast Atom Bombardment | 
| Mass Spectroscopy, Matrix-Assisted Laser Desorption-Ionization use Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization | 
| Mass Spectroscopy, Secondary Ion use Spectrometry, Mass, Secondary Ion | 
| Mass Storage Devices use Computer Storage Devices | 
| Mass Vaccination use Mass Immunization | 
| Massachusetts | 
| Massage | 
| Masseter Muscle | 
| Masseter Muscle Spasm use Trismus | 
| Massive Hepatic Necrosis | 
| Massotherapy use Alternative Therapies | 
| Mast Cell Growth Factor use Stem Cell Factor | 
| Mast Cell Growth Factor-2 use Interleukin-4 | 
| Mast Cells | 
| Mast-Cell Colony-Stimulating Factor use Interleukin-3 | 
| Mast-Cell Disease use Mastocytosis | 
| Mast-Cell Leukemia use Leukemia, Mast-Cell | 
| Mast-Cell Sarcoma | 
| Mastadenovirus | 
| Mastectomy | 
| Mastectomy, Extended Radical | 
| Mastectomy, Modified Radical | 
| Mastectomy, Radical | 
| Mastectomy, Segmental | 
| Mastectomy, Simple | 
| Mastectomy, Subcutaneous | 
| Master Plans | 
| Mastication | 
| Masticatory Force use Bite Force | 
| Masticatory Muscles | 
| Masticatory System use Stomatognathic System | 
| Mastictree use Pistacia | 
| Mastigomycotina use Chytridiomycota | 
| Mastigophora | 
| Mastigophora Infections | 
| Mastitis | 
| Mastitis, Bovine | 
| Mastocytoma | 
| Mastocytoma, Benign use Mastocytoma | 
| Mastocytoma, Malignant use Mast-Cell Sarcoma | 
| Mastocytoma, Skin | 
| Mastocytosis | 
| Mastocytosis, Bullous use Mastocytosis, Cutaneous | 
| Mastocytosis, Cutaneous | 
| Mastocytosis, Diffuse Cutaneous use Mastocytosis, Cutaneous | 
| Mastocytosis, Systemic | 
| Mastoid | 
| Mastoiditis | 
| Mastomys use Murinae | 
| Mastrevirus use Geminiviridae | 
| Masturbation | 
| Matched Case-Control Studies use Case-Control Studies | 
| Matched-Pair Analysis | 
| Mate, Yerba use Ilex paraguariensis | 
| Materia Alba use Dental Deposits | 
| Materia Medica | 
| Materia Medica Dramatization use Materia Medica Study Methods | 
| Materia Medica Sources | 
| Materia Medica Study Methods | 
| Materia Medica, Clinical | 
| Materia Medica, Comparative | 
| Materia Medica, Pure | 
| Material Damage use Damage To Production System | 
| Material Resistance | 
| Material Resources in Health | 
| Materials | 
| Materials Failure Analysis use Equipment Failure Analysis | 
| Materials Management, Hospital | 
| Materials Testing | 
| Materials and Supplies Stockpiling | 
| Maternal Age | 
| Maternal Behavior | 
| Maternal Deprivation | 
| Maternal Exposure | 
| Maternal Health use Maternal Welfare | 
| Maternal Health Services | 
| Maternal Messenger RNA use RNA, Messenger, Stored | 
| Maternal Mortality | 
| Maternal Mortality by Geographic Zone use Maternal Mortality | 
| Maternal Mortality by Specific Risk use Maternal Mortality | 
| Maternal Nutrition | 
| Maternal Nutrition Physiology | 
| Maternal Patterns of Care use Maternal Behavior | 
| Maternal Phenylalanine Hydroxylase Deficiency Disease use Phenylketonuria, Maternal | 
| Maternal Welfare | 
| Maternal and Child Health | 
| Maternal-Child Health Centers | 
| Maternal-Child Health Services | 
| Maternal-Child Nursing | 
| Maternal-Fetal Exchange | 
| Maternal-Fetal Histocompatibility use Histocompatibility, Maternal-Fetal | 
| Maternal-Fetal Relations | 
| Maternally-Acquired Immunity use Immunity, Maternally-Acquired | 
| Maternity Allocation | 
| Maternity Leave use Parental Leave | 
| Maternity Nursing use Maternal-Child Nursing | 
| Mathematical Computing | 
| Mathematical Models | 
| Mathematics | 
| Matico | 
| Mating Behavior, Animal use Sexual Behavior, Animal | 
| Mating Factor Receptors use Receptors, Mating Factor | 
| Mating Preference, Animal | 
| Matricaria | 
| Matricaria chamomilla use Matricaria | 
| Matricaria perforata use Tripleurospermum | 
| Matricaria recutita use Matricaria | 
| Matrilysin use Matrix Metalloproteinase 7 | 
| Matrix Attachment Region Binding Proteins | 
| Matrix Attachment Regions | 
| Matrix Bands | 
| Matrix Metalloproteinase 1 | 
| Matrix Metalloproteinase 10 | 
| Matrix Metalloproteinase 11 | 
| Matrix Metalloproteinase 12 | 
| Matrix Metalloproteinase 13 | 
| Matrix Metalloproteinase 14 | 
| Matrix Metalloproteinase 15 | 
| Matrix Metalloproteinase 16 | 
| Matrix Metalloproteinase 17 | 
| Matrix Metalloproteinase 2 | 
| Matrix Metalloproteinase 20 | 
| Matrix Metalloproteinase 3 | 
| Matrix Metalloproteinase 7 | 
| Matrix Metalloproteinase 8 | 
| Matrix Metalloproteinase 9 | 
| Matrix Metalloproteinases | 
| Matrix Metalloproteinases, Membrane-Associated | 
| Matrix Metalloproteinases, Secreted | 
| Matrix, Extracellular use Extracellular Matrix | 
| Matrix-Assisted Laser Desorption-Ionization Mass Spectrometry use Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization | 
| Matthiola graeca | 
| Matthiola incana use Matthiola graeca | 
| Mattresses use Beds | 
| Maturation-Promoting Factor | 
| Maturing Lagoons | 
| Maturity-Onset Diabetes Mellitus use Diabetes Mellitus, Type 2 | 
| Mauritania | 
| Mauritius | 
| Maus Elberfeld virus | 
| Maxilla | 
| Maxillary Antrum use Maxillary Sinus | 
| Maxillary Artery | 
| Maxillary Diseases | 
| Maxillary Expansion use Palatal Expansion Technique | 
| Maxillary Fractures | 
| Maxillary Neoplasms | 
| Maxillary Nerve | 
| Maxillary Prosthesis use Maxillofacial Prosthesis | 
| Maxillary Ridge Augmentation use Alveolar Ridge Augmentation | 
| Maxillary Sinus | 
| Maxillary Sinus Neoplasms | 
| Maxillary Sinusitis | 
| Maxillofacial Abnormalities | 
| Maxillofacial Development | 
| Maxillofacial Injuries | 
| Maxillofacial Procedures use Oral Surgical Procedures | 
| Maxillofacial Prosthesis | 
| Maxillofacial Prosthesis Implantation | 
| Maxillomandibular Fixation use Jaw Fixation Techniques | 
| Maximal Breathing Capacity use Maximal Voluntary Ventilation | 
| Maximal Expiratory Flow Rate | 
| Maximal Expiratory Flow-Volume Curves | 
| Maximal Midexpiratory Flow Rate | 
| Maximal Tolerated Dose use Maximum Tolerated Dose | 
| Maximal Voluntary Ventilation | 
| Maximally Tolerated Dose use Maximum Tolerated Dose | 
| Maxims use Aphorisms and Proverbs | 
| Maximum Acceptable Dose | 
| Maximum Allowable Cigarette Content | 
| Maximum Allowable Concentration | 
| Maximum Allowable Contents of Coal Tar, Nicotine and Carbon Monoxide use Maximum Allowable Cigarette Content | 
| Maximum Likelihood Estimates use Likelihood Functions | 
| Maximum Permissible Exposure Level use Maximum Allowable Concentration | 
| Maximum Probable Flood | 
| Maximum Probable Precipitation use Probable Maximum Precipitation | 
| Maximum Rise in Water Level use Flood | 
| Maximum Temperature | 
| Maximum Tolerated Dose | 
| Maximum Water Level use Flood | 
| May-White Syndrome use Myoclonic Epilepsies, Progressive | 
| Mayotte use Comoros | 
| Maytansine | 
| Maytenus | 
| Mayweed, Crown use Matricaria | 
| Mayweed, False use Tripleurospermum | 
| Mayweed, Stinking use Anthemis | 
| Maze Learning | 
| Mazindol | 
| McArdle's Disease use Glycogen Storage Disease Type V | 
| McCune-Albright Syndrome use Fibrous Dysplasia, Polyostotic | 
| McGill Pain Questionnaire use Pain Measurement | 
| McNaughton Rule use Insanity Defense | 
| Mdm2 Protein use Proto-Oncogene Proteins c-mdm2 | 
| MeDAB use Methyldimethylaminoazobenzene | 
| Meadow Rue use Thalictrum | 
| Meadow Saffron use Colchicum | 
| Meadowsweet use Filipendula | 
| Meals on Wheels use Food Services | 
| Mealworm use Tenebrio | 
| Mean Corpuscular Volume use Erythrocyte Indices | 
| Meander | 
| Measles | 
| Measles Inclusion Body Encephalitis use Subacute Sclerosing Panencephalitis | 
| Measles Vaccine | 
| Measles Virus, German use Rubella virus | 
| Measles virus | 
| Measles, German use Rubella | 
| Measles-Mumps-Rubella Vaccine | 
| Measurement Equipment | 
| Measurements use Measurements, Methods and Theories | 
| Measurements, Methods and Theories | 
| Measures | 
| Measures of Association, Exposure, Risk or Outcome | 
| Measures of Disease Occurrence | 
| Meat | 
| Meat Industry | 
| Meat Products | 
| Meat-Packing Industry | 
| Meballymal use Secobarbital | 
| Mebendazole | 
| Mebubarbital use Pentobarbital | 
| Mebumal use Pentobarbital | 
| Mecamylamine | 
| Mechanic Flocculators | 
| Mechanical Dynamization | 
| Mechanical Sources | 
| Mechanical Sweeping | 
| Mechanical Ventilator Weaning use Ventilator Weaning | 
| Mechanicism | 
| Mechanics | 
| Mechanization use Automation | 
| Mechanoreceptors | 
| Mechanosensory Transduction use Mechanotransduction, Cellular | 
| Mechanotransduction, Cellular | 
| Mechlorethamine | 
| Mechlorethamine Oxide use Mechlorethamine | 
| Mecillinam use Amdinocillin | 
| Meckel Diverticulum | 
| Meclastine use Clemastine | 
| Meclizine | 
| Meclofenamic Acid | 
| Meclofenoxate | 
| Mecloprodin use Clemastine | 
| Meclozine use Meclizine | 
| Meconine use Meconinum | 
| Meconinum | 
| Meconium | 
| Meconium Aspiration Syndrome | 
| Medaka use Oryzias | 
| Medals use Numismatics | 
| Medazepam | 
| Medetomidine | 
| Medex use Physician Assistants | 
| Medfly use Ceratitis capitata | 
| Medial Collateral Ligament, Knee | 
| Medial Dorsal Nucleus use Mediodorsal Thalamic Nucleus | 
| Medial Forebrain Bundle | 
| Medial Geniculate Body use Geniculate Bodies | 
| Medial Ligament of Knee use Medial Collateral Ligament, Knee | 
| Medial Menisci use Menisci, Tibial | 
| Medial Plantar Nerve use Tibial Nerve | 
| Medial Plantar Neuropathy use Tibial Neuropathy | 
| Medial Pulvinar Nucleus use Pulvinar | 
| Median Eminence | 
| Median Forebrain Bundle use Medial Forebrain Bundle | 
| Median Nerve | 
| Median Nerve Diseases use Median Neuropathy | 
| Median Neuropathy | 
| Mediastinal Cancer use Mediastinal Neoplasms | 
| Mediastinal Cyst | 
| Mediastinal Diseases | 
| Mediastinal Emphysema | 
| Mediastinal Neoplasms | 
| Mediastinitis | 
| Mediastinoscopes | 
| Mediastinoscopic Surgical Procedures use Mediastinoscopy | 
| Mediastinoscopy | 
| Mediastinum | 
| Mediastinum Inflammation use Mediastinitis | 
| Mediating use Negotiating | 
| Mediators of Inflammation use Inflammation Mediators | 
| Medicago | 
| Medicago sativa | 
| Medicago truncatula | 
| Medicaid | 
| Medical Assistance | 
| Medical Assistance, Title 19 use Medicaid | 
| Medical Audit | 
| Medical Audit Program use Commission on Professional and Hospital Activities | 
| Medical Care | 
| Medical Care Costs use Health Care Costs | 
| Medical Care Research use Health Services Research | 
| Medical Care Statistics | 
| Medical Care Team use Patient Care Team | 
| Medical Centers, Academic use Academic Medical Centers | 
| Medical Centers, University use Academic Medical Centers | 
| Medical Climatology use Climatology | 
| Medical Computer Science use Medical Informatics | 
| Medical Decision Making, Computer-Assisted use Decision Making, Computer-Assisted | 
| Medical Device Design use Equipment Design | 
| Medical Device Failure use Equipment Failure | 
| Medical Device Safety use Equipment Safety | 
| Medical Devices use Equipment and Supplies | 
| Medical Directors use Physician Executives | 
| Medical Economics use Economics, Medical | 
| Medical Education use Education, Medical | 
| Medical Education, Continuing use Education, Medical, Continuing | 
| Medical Education, Graduate use Education, Medical, Graduate | 
| Medical Education, Undergraduate use Education, Medical, Undergraduate | 
| Medical Error use Medical Errors | 
| Medical Errors | 
| Medical Examination | 
| Medical Examiners use Coroners and Medical Examiners | 
| Medical Futility | 
| Medical Geography use Geography | 
| Medical History Taking | 
| Medical Illustration | 
| Medical Imaging use Diagnostic Imaging | 
| Medical Indigency | 
| Medical Informatics | 
| Medical Informatics Applications | 
| Medical Informatics Computing | 
| Medical Information Science use Medical Informatics | 
| Medical Journalism use Journalism, Medical | 
| Medical Jurisprudence use Jurisprudence | 
| Medical Laboratory Technology use Technology, Medical | 
| Medical Literature Analysis and Retrieval System use MEDLARS | 
| Medical Missions, Official | 
| Medical Mistake use Medical Errors | 
| Medical Mistakes use Medical Errors | 
| Medical Nutrition Therapy use Nutrition Therapy | 
| Medical Office Buildings | 
| Medical Oncology | 
| Medical Order Entry Systems | 
| Medical Power of Attorney use Advance Directives | 
| Medical Practice Management Services use Practice Management | 
| Medical Psychology use Psychology, Medical | 
| Medical Receptionists | 
| Medical Record Administrators | 
| Medical Record Linkage | 
| Medical Records | 
| Medical Records Department, Hospital | 
| Medical Records Systems, Computerized | 
| Medical Records, Problem-Oriented | 
| Medical Research use Biomedical Research | 
| Medical Savings Accounts | 
| Medical Schools use Schools, Medical | 
| Medical Secretaries | 
| Medical Sociology use Sociology, Medical | 
| Medical Staff | 
| Medical Staff Privileges | 
| Medical Staff Privileges, Nonphysician use Medical Staff Privileges | 
| Medical Staff, Hospital | 
| Medical Subject Headings | 
| Medical Technology use Technology, Medical | 
| Medical Technology Control use Technology Control, Biomedical | 
| Medical Topography use Topography, Medical | 
| Medical Transcription use Medical Records | 
| Medical Waste | 
| Medical Waste Disposal | 
| Medically Assisted Suicide use Suicide, Assisted | 
| Medically Underinsured use Medically Uninsured | 
| Medically Underserved Area | 
| Medically Uninsured | 
| Medicamentous Disease | 
| Medicamentous Tropism | 
| Medicare | 
| Medicare Assignment | 
| Medicare Choice use Medicare Part C | 
| Medicare Hospital Insurance Program use Medicare Part A | 
| Medicare Part A | 
| Medicare Part B | 
| Medicare Part C | 
| Medicare Part D | 
| Medicare Payment Advisory Commission | 
| Medicare Plus Choice use Medicare Part C | 
| Medicare Supplementary Medical Insurance Program use Medicare Part B | 
| Medication Errors | 
| Medication System, Hospital use Medication Systems, Hospital | 
| Medication Systems | 
| Medication Systems, Hospital | 
| Medication Therapy Management | 
| Medicinal Chemistry use Chemistry, Pharmaceutical | 
| Medicinal Herbs use Plants, Medicinal | 
| Medicinal Herbs Store | 
| Medicine | 
| Medicine Chests | 
| Medicine Expiration use Drug Expiration | 
| Medicine Package Insert use Medicine Package Inserts | 
| Medicine Package Inserts | 
| Medicine Package Inserts for the Health Professional use Medicine Package Inserts | 
| Medicine Price use Drug Price | 
| Medicine Prices use Drug Price | 
| Medicine Samples use Drug Samples | 
| Medicine in Art | 
| Medicine in Literature | 
| Medicine, African Traditional | 
| Medicine, Alternative use Complementary Therapies | 
| Medicine, Arabic | 
| Medicine, Ayurvedic | 
| Medicine, Chinese Traditional | 
| Medicine, Complementary use Complementary Therapies | 
| Medicine, Emporiatric use Travel | 
| Medicine, Evidence-Based use Evidence-Based Medicine | 
| Medicine, Folk use Medicine, Traditional | 
| Medicine, Herbal | 
| Medicine, Hindu use Medicine, Ayurvedic | 
| Medicine, Holistic use Holistic Health | 
| Medicine, Indigenous use Medicine, Traditional | 
| Medicine, Kampo | 
| Medicine, Naturopathic use Naturopathy | 
| Medicine, Oriental Traditional | 
| Medicine, Primitive use Medicine, Traditional | 
| Medicine, Tibetan Traditional | 
| Medicine, Traditional | 
| Medicine, Unani | 
| Medicine, Veterinary use Veterinary Medicine | 
| Medicine-Dispensing Establishments | 
| Medieval History use History, Medieval | 
| Medigap Insurance use Insurance, Medigap | 
| Medigoxin | 
| Medina Worm use Dracunculus Nematode | 
| Mediodorsal Thalamic Nucleus | 
| Meditation | 
| Mediterranean Diet use Diet, Mediterranean | 
| Mediterranean Fever, Familial use Familial Mediterranean Fever | 
| Mediterranean Fruit Fly use Ceratitis capitata | 
| Mediterranean Islands | 
| Mediterranean Myoclonic Epilepsy use Unverricht-Lundborg Syndrome | 
| Mediterranean Region | 
| Mediterranean Sea | 
| Mediterranean Spotted Fever use Boutonneuse Fever | 
| Medium Cities | 
| Medium Communities | 
| MedlinePlus | 
| Medorrhinum | 
| Medosan use Acetylcarnitine | 
| Medphalan use Melphalan | 
| Medrogestone | 
| Medroxyprogesterone | 
| Medroxyprogesterone 17-Acetate | 
| Medulla Oblongata | 
| Medullary Hemorrhage, Traumatic use Brain Stem Hemorrhage, Traumatic | 
| Medullary Neoplasms use Brain Stem Neoplasms | 
| Medullary Sponge Kidney | 
| Medulloblastoma | 
| Medulloblastoma, Desmoplastic use Medulloblastoma | 
| Medulloepithelioma use Neuroectodermal Tumors, Primitive | 
| Medullomyoblastoma use Medulloblastoma | 
| Medusa (Homeopathy) | 
| Meeting Abstracts | 
| Mefenamic Acid | 
| Mefloquine | 
| Mefruside | 
| Megacins | 
| Megacolon | 
| Megacolon, Congenital use Hirschsprung Disease | 
| Megacolon, Toxic | 
| Megaesophagus use Esophageal Achalasia | 
| Megakaryoblastic Leukemia, Acute use Leukemia, Megakaryoblastic, Acute | 
| Megakaryocyte Growth and Development Factor use Thrombopoietin | 
| Megakaryocytes | 
| Megakaryocytic Leukemia use Leukemia, Megakaryoblastic, Acute | 
| Megakaryocytic Leukemia, Acute use Leukemia, Megakaryoblastic, Acute | 
| Megakaryocytopoiesis use Thrombopoiesis | 
| Megalin use LDL-Receptor Related Protein 2 | 
| Megaloblasts | 
| Megalocytivirus use Iridoviridae | 
| Megalopolis use Metropolis | 
| Megasphaera | 
| Megaton | 
| Megavitamin Therapy use Orthomolecular Therapy | 
| Megavolt Radiotherapy use Radiotherapy, High-Energy | 
| Megestrol | 
| Megestrol Acetate | 
| Meglumine | 
| Meglumine Diatrizoate use Diatrizoate Meglumine | 
| Meglumine Iothalamate use Iothalamate Meglumine | 
| Meglutol | 
| Meibomian Cyst use Chalazion | 
| Meibomian Glands | 
| Meige Syndrome | 
| Meigs Syndrome | 
| Meiosis | 
| Meiotic Prophase I | 
| Meissner's Corpuscle use Mechanoreceptors | 
| Meissner's Plexus use Submucous Plexus | 
| Mekong Valley | 
| Melaleuca | 
| Melaleuca alternifolia Oil use Tea Tree Oil | 
| Melaleuca hypericifolia | 
| Melaleuca leucadendron use Cajuputum | 
| Melancholia use Depressive Disorder | 
| Melancholia, Involutional use Depressive Disorder, Major | 
| Melanesia | 
| Melanins | 
| Melanism use Melanosis | 
| Melanoameloblastoma use Neuroectodermal Tumor, Melanotic | 
| Melanocortin Receptor 1 use Receptor, Melanocortin, Type 1 | 
| Melanocortin Receptor 2 use Receptor, Melanocortin, Type 2 | 
| Melanocortin Receptor 3 use Receptor, Melanocortin, Type 3 | 
| Melanocortin Receptor 4 use Receptor, Melanocortin, Type 4 | 
| Melanocortin Receptors use Receptors, Melanocortin | 
| Melanocortins | 
| Melanocyte-Stimulating Hormone Release-Inhibiting Hormone use MSH Release-Inhibiting Hormone | 
| Melanocyte-Stimulating Hormone, beta use beta-MSH | 
| Melanocyte-Stimulating Hormone, gamma use gamma-MSH | 
| Melanocyte-Stimulating Hormones | 
| Melanocytes | 
| Melanocytic Vestibular Schwannoma use Neuroma, Acoustic | 
| Melanoma | 
| Melanoma, Amelanotic | 
| Melanoma, B16 use Melanoma, Experimental | 
| Melanoma, Cloudman S91 use Melanoma, Experimental | 
| Melanoma, Experimental | 
| Melanoma, Harding-Passey use Melanoma, Experimental | 
| Melanoma, Malignant, of Soft Parts use Sarcoma, Clear Cell | 
| Melanomas and Nevi use Nevi and Melanomas | 
| Melanophores | 
| Melanosis | 
| Melanosomes | 
| Melanotic Freckle use Hutchinson's Melanotic Freckle | 
| Melanotrophs | 
| Melanotropin use Melanocyte-Stimulating Hormones | 
| Melarsoprol | 
| Melasma use Melanosis | 
| Melastama ackermanni | 
| Melastomataceae | 
| Melatonin | 
| Melatonin MT1 Receptor use Receptor, Melatonin, MT1 | 
| Melatonin MT2 Receptor use Receptor, Melatonin, MT2 | 
| Melatonin Receptors use Receptors, Melatonin | 
| Meleagrid herpesvirus 1 use Herpesvirus 1, Meleagrid | 
| Meleagridinae use Turkeys | 
| Meleda Disease use Keratoderma, Palmoplantar | 
| Melena | 
| Melengestrol Acetate | 
| Melia | 
| Melia azadirachta use Azadirachta | 
| Melia azadirachta indica use Azadirachta indica | 
| Melia azedarach | 
| Meliaceae | 
| Melibiose | 
| Melicope use Rutaceae | 
| Melilotus | 
| Melilotus alba | 
| Melilotus officinalis | 
| Melioidosis | 
| Melissa | 
| Melissa officinalis | 
| Melissa pulegioides use Hedeoma | 
| Melitagrinum | 
| Melitose use Raffinose | 
| Melitriose use Raffinose | 
| Melitten | 
| Melittin use Melitten | 
| Melkersson-Rosenthal Syndrome | 
| Mellitin use Melitten | 
| Melnick-Needles Syndrome use Osteochondrodysplasias | 
| Meloidogyne use Tylenchoidea | 
| Melolontha vulgaris | 
| Melon-Headed Whale use Dolphins | 
| Melons use Cucurbitaceae | 
| Melopsittacus | 
| Melorheostosis | 
| Melothria use Cucurbitaceae | 
| Melphalan | 
| Melt Water | 
| Memantine | 
| Membrane Alanyl Aminopeptidase use Antigens, CD13 | 
| Membrane Attack Complex use Complement Membrane Attack Complex | 
| Membrane Attack Complex Inhibition Factor use Antigens, CD59 | 
| Membrane Channels use Ion Channels | 
| Membrane Filters | 
| Membrane Filtration | 
| Membrane Fluidity | 
| Membrane Fusion | 
| Membrane Fusion Proteins | 
| Membrane Glycoproteins | 
| Membrane Lipids | 
| Membrane Metallo-Endopeptidase use Neprilysin | 
| Membrane Microdomains | 
| Membrane Potential, Mitochondrial | 
| Membrane Potentials | 
| Membrane Proteins | 
| Membrane Proteins, Viral use Viral Matrix Proteins | 
| Membrane Transport Modulators | 
| Membrane Transport Proteins | 
| Membrane Transport Proteins, Mitochondrial use Mitochondrial Membrane Transport Proteins | 
| Membrane Transport Proteins, Organic Anion use Organic Anion Transporters | 
| Membrane Transport-Proteins, Organic Cation use Organic Cation Transport Proteins | 
| Membrane Transporters use Membrane Transport Proteins | 
| Membrane-Type Matrix Metalloproteinase use Matrix Metalloproteinases, Membrane-Associated | 
| Membranes | 
| Membranes (Filters) use Membrane Filters | 
| Membranes, Artificial | 
| Membranes, Intracellular use Intracellular Membranes | 
| Membranoproliferative Glomerulonephritis use Glomerulonephritis, Membranoproliferative | 
| Membranous Glomerulopathy use Glomerulonephritis, Membranous | 
| Memerism (Homeopathy) use Alternative Therapies | 
| Memory | 
| Memory Disorders | 
| Memory Loss use Memory Disorders | 
| Memory Loss, Anterograde use Amnesia, Anterograde | 
| Memory for Designs Test use Neuropsychological Tests | 
| Memory, Immediate use Memory, Short-Term | 
| Memory, Photographic use Eidetic Imagery | 
| Memory, Short-Term | 
| Men | 
| Men's Health | 
| Menadione use Vitamin K 3 | 
| Menadione Reductase use NAD(P)H Dehydrogenase (Quinone) | 
| Menaquinone use Vitamin K 2 | 
| Menarche | 
| Mendelevium | 
| Menetrier Disease use Gastritis, Hypertrophic | 
| Mengovirus | 
| Menichlopholan use Niclofolan | 
| Meniere Disease | 
| Meniere's Disease use Meniere Disease | 
| Meniere's Syndrome use Meniere Disease | 
| Meningeal Arteries | 
| Meningeal Herniation use Meningocele | 
| Meningeal Neoplasms | 
| Meningeal Plague use Plague | 
| Meninges | 
| Meningioma | 
| Meningiomas, Multiple use Meningioma | 
| Meningiomatosis use Meningioma | 
| Meningism | 
| Meningismus use Meningism | 
| Meningitis | 
| Meningitis, Aseptic | 
| Meningitis, Bacterial | 
| Meningitis, Cryptococcal | 
| Meningitis, Escherichia coli | 
| Meningitis, Fungal | 
| Meningitis, Haemophilus | 
| Meningitis, Listeria | 
| Meningitis, Meningococcal | 
| Meningitis, Pneumococcal | 
| Meningitis, Streptococcus pneumoniae use Meningitis, Pneumococcal | 
| Meningitis, Tuberculous use Tuberculosis, Meningeal | 
| Meningitis, Viral | 
| Meningocele | 
| Meningococcal Hemorrhagic Adrenalitis use Waterhouse-Friderichsen Syndrome | 
| Meningococcal Infections | 
| Meningococcal Vaccines | 
| Meningococcinum | 
| Meningococcus use Neisseria meningitidis | 
| Meningococcus, Serogroup A use Neisseria meningitidis, Serogroup A | 
| Meningococcus, Serogroup B use Neisseria meningitidis, Serogroup B | 
| Meningococcus, Serogroup C use Neisseria meningitidis, Serogroup C | 
| Meningococcus, Serogroup Y use Neisseria meningitidis, Serogroup Y | 
| Meningoencephalitis | 
| Meningoencephalitis, Herpes Simplex Virus use Encephalitis, Herpes Simplex | 
| Meningoencephalitis, Herpes Zoster use Encephalitis, Varicella Zoster | 
| Meningoencephalitis, Listeria use Meningitis, Listeria | 
| Meningoencephalitis, Protozoal use Central Nervous System Protozoal Infections | 
| Meningoencephalitis, St. Louis use Encephalitis, St. Louis | 
| Meningomyelocele | 
| Menisci, Lateral use Menisci, Tibial | 
| Menisci, Medial use Menisci, Tibial | 
| Menisci, Tibial | 
| Menispermaceae | 
| Menispermum | 
| Menispermum canadense | 
| Menkes Kinky Hair Syndrome | 
| Menkes Syndrome use Menkes Kinky Hair Syndrome | 
| Menogaril | 
| Menopause | 
| Menopause, Premature | 
| Menorrhagia | 
| Menotropin Receptors use Receptors, Gonadotropin | 
| Menotropins | 
| Menstrual Cycle | 
| Menstrual Cycle, Follicular Phase use Follicular Phase | 
| Menstrual Cycle, Luteal Phase use Luteal Phase | 
| Menstrual Cycle, Proliferative Phase use Follicular Phase | 
| Menstrual Cycle, Secretory Phase use Luteal Phase | 
| Menstrual Hygiene Products | 
| Menstrual Proliferative Phase use Follicular Phase | 
| Menstrual Secretory Phase use Luteal Phase | 
| Menstruation | 
| Menstruation Disorders use Menstruation Disturbances | 
| Menstruation Disturbances | 
| Menstruation, Painful use Dysmenorrhea | 
| Menstruation, Retrograde use Menstruation Disturbances | 
| Menstruation-Inducing Agents | 
| Mental Competency | 
| Mental Disorders | 
| Mental Disorders Diagnosed in Childhood | 
| Mental Disorders, Organic use Delirium, Dementia, Amnestic, Cognitive Disorders | 
| Mental Fatigue | 
| Mental Healing | 
| Mental Health | 
| Mental Health Assistance | 
| Mental Health Associations | 
| Mental Health Services | 
| Mental Health Services, Community use Community Mental Health Services | 
| Mental Hospitals use Hospitals, Psychiatric | 
| Mental Hygiene use Mental Health | 
| Mental Hygiene Services use Mental Health Services | 
| Mental Patients use Mentally Ill Persons | 
| Mental Processes | 
| Mental Recall | 
| Mental Retardation | 
| Mental Retardation, X-Linked | 
| Mental Status Schedule | 
| Mental Suffering use Stress, Psychological | 
| Mental Symptoms use Symptoms, Psychic | 
| Mental Tests use Intelligence Tests | 
| Mentally Disabled use Mentally Disabled Persons | 
| Mentally Disabled Persons | 
| Mentally Handicapped use Mentally Disabled Persons | 
| Mentally Ill Persons | 
| Mentha | 
| Mentha piperita | 
| Mentha pulegium | 
| Mentha spicata | 
| Mentha viridis | 
| Menthol | 
| Mentholum | 
| Mentors | 
| Mentorships use Mentors | 
| Menu Planning | 
| Menyanthes trifoliata | 
| Mepacrine use Quinacrine | 
| Mepartricin | 
| Meperidine | 
| Mephenesin | 
| Mephentermine | 
| Mephenytoin | 
| Mephitidae | 
| Mephitis use Mephitidae | 
| Mephitis americana use Mephitis putorius | 
| Mephitis putorius | 
| Mephobarbital | 
| Mepirizole use Epirizole | 
| Mepivacaine | 
| Meprobamate | 
| Meptazinol | 
| Mepyramine use Pyrilamine | 
| Meractinomycin use Dactinomycin | 
| Merbromin | 
| Mercalli Scale | 
| Mercaptamine use Cysteamine | 
| Mercapto Compounds use Sulfhydryl Compounds | 
| Mercaptoethanol | 
| Mercaptoethylamines | 
| Mercaptophos use Fenthion | 
| Mercaptopropionylglycine use Thiopronine | 
| Mercaptovaline use Penicillamine | 
| Mercapturic Acid use Acetylcysteine | 
| Mercenaria | 
| Mercuramide use Mersalyl | 
| Mercurialis perennis | 
| Mercurialism, Nervous System use Mercury Poisoning, Nervous System | 
| Mercurialism, Neurologic use Mercury Poisoning, Nervous System | 
| Mercuribenzoates | 
| Mercuric Chloride | 
| Mercurius Aceticus | 
| Mercurius Auratus | 
| Mercurius Biiodatus cun Kali Iodato | 
| Mercurius Bromatus | 
| Mercurius Corrosivus | 
| Mercurius Cyanatus | 
| Mercurius Dulcis | 
| Mercurius Iodatus Flavus | 
| Mercurius Iodatus Ruber | 
| Mercurius Methylenus | 
| Mercurius Nitrosus | 
| Mercurius Phosphoricus | 
| Mercurius Praecipitatus Albus | 
| Mercurius Praecipitatus Flavus | 
| Mercurius Praecipitatus Ruber | 
| Mercurius Protoiodatus use Mercurius Iodatus Flavus | 
| Mercurius Solubilis | 
| Mercurius Sulphocyanatus | 
| Mercurius Sulphuricus | 
| Mercurius Tannicus | 
| Mercurius cun Kali use Aethiops Mineralis | 
| Mercurius et Kali Iodatus use Mercurius Biiodatus cun Kali Iodato | 
| Mercurothiolate use Thimerosal | 
| Mercury | 
| Mercury (Planet) | 
| Mercury Compounds | 
| Mercury Dichloride use Mercuric Chloride | 
| Mercury Encephalopathy use Mercury Poisoning, Nervous System | 
| Mercury I Sulfide use Aethiops Mineralis | 
| Mercury Isotopes | 
| Mercury Poisoning | 
| Mercury Poisoning, Nervous System | 
| Mercury Radioisotopes | 
| Mercury-Induced Nervous System Diseases use Mercury Poisoning, Nervous System | 
| Mercy Killing use Euthanasia | 
| Merger, Health Facility use Health Facility Merger | 
| Meridians | 
| Meriones use Gerbillinae | 
| Meristem | 
| Merkel Cell Tumor use Carcinoma, Merkel Cell | 
| Merkel Cells | 
| Merkel's Receptor use Merkel Cells | 
| Mermithid use Mermithoidea | 
| Mermithoidea | 
| Meromyosin Subfragments use Myosin Subfragments | 
| Merosin use Laminin | 
| Merozoite Surface Protein 1 | 
| Merozoites | 
| Merphalan use Melphalan | 
| Merremia use Convolvulaceae | 
| Mersalyl | 
| Mesalamine | 
| Mesalazine use Mesalamine | 
| Mesangial Cells | 
| Mesangiocapillary Glomerulonephritis use Glomerulonephritis, Membranoproliferative | 
| Mesangium, Glomerular use Glomerular Mesangium | 
| Mescal Bean Plant use Sophora | 
| Mescaline | 
| Mesembryanthemum | 
| Mesencephalic Central Gray use Periaqueductal Gray | 
| Mesencephalic Neoplasms use Brain Stem Neoplasms | 
| Mesencephalon | 
| Mesenchymal Stem Cell Transplantation | 
| Mesenchymal Stem Cells | 
| Mesenchyme use Mesoderm | 
| Mesenchymoma | 
| Mesenteric Arteries | 
| Mesenteric Artery, Inferior | 
| Mesenteric Artery, Superior | 
| Mesenteric Circulation use Splanchnic Circulation | 
| Mesenteric Cyst | 
| Mesenteric Duodenal Compression Syndrome use Superior Mesenteric Artery Syndrome | 
| Mesenteric Lymphadenitis | 
| Mesenteric Panniculitis use Panniculitis, Peritoneal | 
| Mesenteric Vascular Occlusion | 
| Mesenteric Veins | 
| Mesentery | 
| Mesial Movement of Teeth | 
| Mesilate use Mesylates | 
| Mesmerism use Hypnosis | 
| Mesna | 
| Meso-Oceanic Mountain Chain | 
| Meso-Scale Oceanic Mountain Chain use Meso-Oceanic Mountain Chain | 
| Mesocestoides | 
| Mesocolon | 
| Mesocricetus | 
| Mesocricetus auratus use Mesocricetus | 
| Mesocyclops use Copepoda | 
| Mesoderm | 
| Mesomorph use Somatotypes | 
| Mesomycetozoea | 
| Mesomycetozoea Infections | 
| Mesona use Lamiaceae | 
| Mesonephroma | 
| Mesonephros | 
| Mesons | 
| Mesoplasma use Entomoplasmataceae | 
| Mesoplodon use Whales | 
| Mesoporphyrins | 
| Mesoridazine | 
| Mesosigmoid use Mesocolon | 
| Mesosphere | 
| Mesothelioma | 
| Mesothelioma, Cystic | 
| Mesothelium use Epithelium | 
| Mesozoa use Invertebrates | 
| Mespillus germanica | 
| Mesquite use Prosopis | 
| Messenger RNA use RNA, Messenger | 
| Messenger RNA, Polyadenylated use RNA, Messenger | 
| Mesterolone | 
| Mestranol | 
| Mesulam Syndrome use Aphasia, Primary Progressive | 
| Mesylates | 
| Meta-Analysis | 
| Meta-Analysis as Topic | 
| Metabolic Activation use Biotransformation | 
| Metabolic Clearance Rate | 
| Metabolic Detoxication, Drug | 
| Metabolic Detoxication, Phase I | 
| Metabolic Detoxication, Phase II | 
| Metabolic Diseases | 
| Metabolic Diseases, Inborn, Brain use Brain Diseases, Metabolic, Inborn | 
| Metabolic Disorders, Brain use Brain Diseases, Metabolic | 
| Metabolic Networks and Pathways | 
| Metabolic Processes use Metabolism | 
| Metabolic Pump use Membrane Transport Proteins | 
| Metabolic Syndrome X | 
| Metabolism | 
| Metabolism and Endocrinology (Specialty) use Endocrinology | 
| Metabolism, Basal use Basal Metabolism | 
| Metabolism, Carbohydrate use Carbohydrate Metabolism | 
| Metabolism, Inborn Errors | 
| Metabolite Markers, Neoplasm use Tumor Markers, Biological | 
| Metabotropic Glutamate Receptors use Receptors, Metabotropic Glutamate | 
| Metacarpal Bones | 
| Metacarpals use Metacarpal Bones | 
| Metacarpophalangeal Joint | 
| Metacarpus | 
| Metagonimiasis use Trematode Infections | 
| Metagonimus use Heterophyidae | 
| Metal Antagonists use Chelating Agents | 
| Metal Ceramic Alloys | 
| Metal Ceramic Restorations use Metal Ceramic Alloys | 
| Metal Finishing use Galvanoplastic Industry | 
| Metal Metabolism, Inborn Errors | 
| Metal Nanocrystals use Metal Nanoparticles | 
| Metal Nanoparticles | 
| Metal Plating use Electroplating | 
| Metal Vapor Lasers use Lasers, Gas | 
| Metallic Cadmium use Cadmium Metallicum | 
| Metallic Cesium use Caesium Metallicum | 
| Metallic Silver use Argentum Metallicum | 
| Metallic Tracers use Inorganic Tracers | 
| Metallic Wastes | 
| Metallo-Ceramic Alloys use Metal Ceramic Alloys | 
| Metallo-Organic Compounds use Organometallic Compounds | 
| Metalloendopeptidases | 
| Metalloexopeptidases | 
| Metalloporphyrins | 
| Metalloproteases | 
| Metalloproteinases use Metalloproteases | 
| Metalloproteins | 
| Metallosphaera use Sulfolobaceae | 
| Metallothionein | 
| Metallurgy | 
| Metalmechanic Industry | 
| Metals | 
| Metals, Actinoid use Actinoid Series Elements | 
| Metals, Alkali | 
| Metals, Alkaline Earth | 
| Metals, Heavy | 
| Metals, Light | 
| Metals, Rare Earth | 
| Metamizole use Dipyrone | 
| Metamorphosis, Biological | 
| Metandienone use Methandrostenolone | 
| Metanephrine | 
| Metapenaeus use Penaeidae | 
| Metaphase | 
| Metaphor | 
| Metaphos use Methyl Parathion | 
| Metaphysics | 
| Metaplasia | 
| Metapneumovirus | 
| Metapneumovirus, Avian use Metapneumovirus | 
| Metapneumovirus, Human use Metapneumovirus | 
| Metaproterenol use Orciprenaline | 
| Metaradrin use Metaraminol | 
| Metaraminol | 
| Metarhizium | 
| Metastasis use Neoplasm Metastasis | 
| Metastasis Suppressor Genes use Genes, Tumor Suppressor | 
| Metastasis Suppressor Proteins use Tumor Suppressor Proteins | 
| Metastrongyloidea | 
| Metatarsal Bones | 
| Metatarsal Deformity use Foot Deformities | 
| Metatarsalgia | 
| Metatarsals use Metatarsal Bones | 
| Metatarsophalangeal Joint | 
| Metatarsus | 
| Metatarsus Primus Varus use Hallux Valgus | 
| Metathalamus use Geniculate Bodies | 
| Metatheria use Marsupialia | 
| Metathesaurus use Unified Medical Language System | 
| Metavanadate use Vanadates | 
| Metencephalon | 
| Meteorites use Meteoroids | 
| Meteorization use Rock Decomposition | 
| Meteoroids | 
| Meteorological Disaster | 
| Meteorological Factors | 
| Meteorological Measurements use Meteorological Statistics | 
| Meteorological Sounding | 
| Meteorological Stations | 
| Meteorological Statistics | 
| Meteorology | 
| Meteors use Meteoroids | 
| Meteosat | 
| Metered Dose Inhalers | 
| Metergoline | 
| Meters | 
| Metestrus | 
| Metformin | 
| Methacholine use Methacholine Chloride | 
| Methacholine Chloride | 
| Methacholine Compounds | 
| Methacrylates | 
| Methacrylic Acid Polymers use Polymethacrylic Acids | 
| Methacycline | 
| Methadone | 
| Methadyl Acetate | 
| Methalamic Acid use Iothalamic Acid | 
| Methallibure | 
| Methaminodiazepoxide use Chlordiazepoxide | 
| Methamphetamine | 
| Methampyrone use Dipyrone | 
| Methandienone use Methandrostenolone | 
| Methandriol | 
| Methandrostenolone | 
| Methane | 
| Methane-Oxidizing Bacteria use Methylococcaceae | 
| Methanesulfonates use Mesylates | 
| Methanoate use Formates | 
| Methanoates use Formates | 
| Methanobacteriaceae | 
| Methanobacteriales | 
| Methanobacterium | 
| Methanobrevibacter | 
| Methanococcaceae | 
| Methanococcales | 
| Methanococcoides use Methanosarcinaceae | 
| Methanococcus | 
| Methanocorpusculaceae use Methanomicrobiales | 
| Methanoculleus use Methanomicrobiaceae | 
| Methanofollis use Methanomicrobiaceae | 
| Methanogenium use Methanomicrobiaceae | 
| Methanol | 
| Methanolacinia use Methanomicrobiaceae | 
| Methanolobus use Methanosarcinaceae | 
| Methanomicrobiaceae | 
| Methanomicrobiales | 
| Methanomicrobium use Methanomicrobiaceae | 
| Methanomonadaceae use Methylococcaceae | 
| Methanoococci use Euryarchaeota | 
| Methanoplanus use Methanomicrobiaceae | 
| Methanopyri use Euryarchaeota | 
| Methanosaetaceae use Methanosarcinales | 
| Methanosarcina | 
| Methanosarcina barkeri | 
| Methanosarcinaceae | 
| Methanosarcinales | 
| Methanosphaera use Methanobacteriaceae | 
| Methanospirillaceae use Methanospirillum | 
| Methanospirillum | 
| Methanothermobacter use Methanobacteriaceae | 
| Methanothermococcus use Methanococcaceae | 
| Methanothrix use Methanosarcinaceae | 
| Methapyrilene | 
| Methaqualone | 
| Methazolamide | 
| Methbipyranone use Metyrapone | 
| Methemalbumin | 
| Methemoglobin | 
| Methemoglobinemia | 
| Methenamine | 
| Methenolone | 
| Methenyltetrahydrofolate Cyclohydrolase | 
| Methergoline use Metergoline | 
| Methetharimide use Bemegride | 
| Methicillin | 
| Methicillin Resistance | 
| Methimazole | 
| Methiocarb | 
| Methionine | 
| Methionine Adenosyltransferase | 
| Methionine Enkephalin use Enkephalin, Methionine | 
| Methionine Methylsulfonium Chloride use Vitamin U | 
| Methionine Sulfoximine | 
| Methionine Synthetase use 5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase | 
| Methionine-Specific tRNA use RNA, Transfer, Met | 
| Methionine-Specific tRNAm use RNA, Transfer, Met | 
| Methionine-tRNA Ligase | 
| Methionyl T RNA Synthetase use Methionine-tRNA Ligase | 
| Methiothepin | 
| Methisazone | 
| Methisoprinol use Inosine Pranobex | 
| Methocarbamol | 
| Methodologies, Computing use Computing Methodologies | 
| Methodology | 
| Methodology Research, Nursing use Nursing Methodology Research | 
| Methods | 
| Methods of Planning use Planning Techniques | 
| Methofluranum use Methoxyflurane | 
| Methohexital | 
| Methohexitone use Methohexital | 
| Methoin use Mephenytoin | 
| Methomyl | 
| Methonium Compounds use Bis-Trimethylammonium Compounds | 
| Methoprene | 
| Methopyrapone use Metyrapone | 
| Methopyrimazole use Epirizole | 
| Methotrexate | 
| Methotrimeprazine | 
| Methoxamedrin use Methoxamine | 
| Methoxamine | 
| Methoxatin use PQQ Cofactor | 
| Methoxsalen | 
| Methoxychlor | 
| Methoxydimethyltryptamines | 
| Methoxyflurane | 
| Methoxyhydroxymandelic Acid use Vanilmandelic Acid | 
| Methoxyhydroxyphenylethanol use 3-Methoxy-4-hydroxyphenylethanol | 
| Methoxyhydroxyphenylglycol | 
| Methoxyverapamil use Gallopamil | 
| Methyclothiazide | 
| Methyl Chloride | 
| Methyl Chloro Formate use Formates | 
| Methyl Clofenapate use Clofenapate | 
| Methyl Cyanides use Acetonitriles | 
| Methyl Ethers | 
| Methyl Formate use Formates | 
| Methyl Green | 
| Methyl Isocyanate Escape | 
| Methyl Mercury Compounds use Methylmercury Compounds | 
| Methyl Methanesulfonate | 
| Methyl Parathion | 
| Methyl Phenetoin use Mephenytoin | 
| Methyl Propyl Ketones use Pentanones | 
| Methyl Violet use Gentian Violet | 
| Methyl Viologen use Paraquat | 
| Methyl n-Butyl Ketone | 
| Methyl-CCNU use Semustine | 
| Methyl-CpG-Binding Protein 2 | 
| Methyladenine Receptors use Receptors, Purinergic | 
| Methylamines | 
| Methylandrostenediol use Methandriol | 
| Methylarecaidin use Arecoline | 
| Methylated-DNA-Protein-Cysteine S-Methyltransferase use O(6)-Methylguanine-DNA Methyltransferase | 
| Methylation | 
| Methylazoxymethanol Acetate | 
| Methylazoxymethanol beta-D-Glucoside use Cycasin | 
| Methylbufotenin use Methoxydimethyltryptamines | 
| Methylcellulose | 
| Methylcephaeline use Emetine | 
| Methylcholanthrene | 
| Methyldimethylaminoazobenzene | 
| Methyldinitrobenzamide use Dinitolmide | 
| Methyldiphenylhydramine use Orphenadrine | 
| Methyldopa | 
| Methyldopahydrazine use Carbidopa | 
| Methyldopamine use Deoxyepinephrine | 
| Methyldopate use Methyldopa | 
| Methylene Bichloride use Methylene Chloride | 
| Methylene Bis(chloroaniline) use Methylenebis(chloroaniline) | 
| Methylene Blue | 
| Methylene Chloride | 
| Methylene Dichloride use Methylene Chloride | 
| Methylene-THF Reductase (NADPH) use Methylenetetrahydrofolate Reductase (NADPH2) | 
| Methylenebis(chloroaniline) | 
| Methylenedioxybenzenes use Benzodioxoles | 
| Methylenedioxymethamphetamine use N-Methyl-3,4-methylenedioxyamphetamine | 
| Methylenetetrahydrofolate Dehydrogenase (NAD+) | 
| Methylenetetrahydrofolate Dehydrogenase (NADP) | 
| Methylenetetrahydrofolate Dehydrogenase (NADP+) use Methylenetetrahydrofolate Dehydrogenase (NADP) | 
| Methylenetetrahydrofolate Reductase (NADPH2) | 
| Methylenum Coeruleum | 
| Methylergobasin use Methylergonovine | 
| Methylergol Carbamide use Lisuride | 
| Methylergometrin use Methylergonovine | 
| Methylergonovine | 
| Methylesculetin use Scopoletin | 
| Methylgalactopyranosides use Methylgalactosides | 
| Methylgalactose use Methylgalactosides | 
| Methylgalactosides | 
| Methylglucamine use Meglumine | 
| Methylglucamine Diatrizoate use Diatrizoate Meglumine | 
| Methylglucopyranosides use Methylglucosides | 
| Methylglucosides | 
| Methylglycine use Sarcosine | 
| Methylglycosides | 
| Methylglyoxal use Pyruvaldehyde | 
| Methylglyoxal Bis(guanylhydrazone) use Mitoguazone | 
| Methylglyoxalase use Lactoylglutathione Lyase | 
| Methylguanidine | 
| Methylhistamines | 
| Methylhistidines | 
| Methylhydrazine use Monomethylhydrazine | 
| Methylhydrazines | 
| Methylhydroxyprogesterone use Medroxyprogesterone | 
| Methylium Aethyloaethereum | 
| Methylium Salicylicum | 
| Methylium salicycum use Methylium Salicylicum | 
| Methylmaleic Anhydrides use Citraconic Anhydrides | 
| Methylmalonate-Semialdehyde Dehydrogenase (Acylating) | 
| Methylmalonic Acid | 
| Methylmalonyl-CoA Decarboxylase | 
| Methylmalonyl-CoA Isomerase use Methylmalonyl-CoA Mutase | 
| Methylmalonyl-CoA Mutase | 
| Methylmannopyranosides use Methylmannosides | 
| Methylmannosides | 
| Methylmercadone use Nifuratel | 
| Methylmercury use Methylmercury Compounds | 
| Methylmercury Compounds | 
| Methylmethacrylate | 
| Methylmethacrylate Methyl Monomer use Methylmethacrylate | 
| Methylmethacrylates | 
| Methylmethane Sulfonate use Methyl Methanesulfonate | 
| Methylmethioninesulfonium Chloride use Vitamin U | 
| Methylmethylergonovine use Methysergide | 
| Methylmitomycin C use Porfiromycin | 
| Methylnitronitrosoguanidine | 
| Methylnitrosonitroguanidine use Methylnitronitrosoguanidine | 
| Methylnitrosourea | 
| Methylnitrosourethane use Nitrosomethylurethane | 
| Methylnorepinephrine use Nordefrin | 
| Methylobacillus | 
| Methylobacillus flagellatum use Methylobacillus | 
| Methylobacteriaceae | 
| Methylobacterium | 
| Methylobacterium extorquens | 
| Methylococcaceae | 
| Methylococcus | 
| Methylococcus capsulatus | 
| Methylocystaceae | 
| Methylocystis use Methylocystaceae | 
| Methylomonadaceae use Methylococcaceae | 
| Methylomonas | 
| Methylophilaceae | 
| Methylophilus | 
| Methylophilus methylotrophus | 
| Methylosinus | 
| Methylosinus trichosporium | 
| Methyloxazepam use Temazepam | 
| Methylpartricin use Mepartricin | 
| Methylphenazonium Methosulfate | 
| Methylphenidate | 
| Methylphenobarbital use Mephobarbital | 
| Methylphenyl Ethers use Anisoles | 
| Methylprednisolone | 
| Methylprednisolone Hemisuccinate | 
| Methylprednisolone Succinate use Methylprednisolone Hemisuccinate | 
| Methylpromazine use Trimeprazine | 
| Methylrosaniline Chloride use Gentian Violet | 
| Methylstanazol use Stanozolol | 
| Methylsulfadiazine use Sulfamerazine | 
| Methyltestosterone | 
| Methyltetrahydrofolate Homocysteine Methyltransferase use 5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase | 
| Methylthioinosine | 
| Methylthionine Chloride use Methylene Blue | 
| Methylthiouracil | 
| Methyltransferases | 
| Methyltrienolone use Metribolone | 
| Methyltyramine use p-Hydroxyamphetamine | 
| Methyltyrosines | 
| Methylumbelliferone use Hymecromone | 
| Methylurea Compounds | 
| Methymazol use Methimazole | 
| Methysergide | 
| Metiamide | 
| Meticlorpindol use Clopidol | 
| Metildigoxin use Medigoxin | 
| Metindamide use Indapamide | 
| Metipranolol | 
| Metitepine use Methiothepin | 
| Metmyoglobin | 
| Metoclopramide | 
| Metolazone | 
| Metolquizolone use Methaqualone | 
| Metoprolol | 
| Metrial Gland | 
| Metribolone | 
| Metric System | 
| Metrifonate use Trichlorfon | 
| Metrizamide | 
| Metrizoate | 
| Metronidazole | 
| Metropolis | 
| Metropolitan Government use Local Government | 
| Metropolitan Zones | 
| Metrorrhagia | 
| Metroxylon use Arecaceae | 
| Metyrapone | 
| Mevalonate Kinase Deficiency | 
| Mevalonic Acid | 
| Mevinolin use Lovastatin | 
| Mevinphos | 
| Mexican Americans | 
| Mexico | 
| Mexiletine | 
| Mezcalin use Mescaline | 
| Mezereum | 
| Mezlocillin | 
| MgADP use Adenosine Diphosphate | 
| MgATP use Adenosine Triphosphate | 
| Mianserin | 
| Miasm | 
| Miasm Dynamics | 
| Miasmatic Philosophy use Miasm | 
| Miasmatic Theory use Miasm | 
| Mibefradil | 
| Mica | 
| Mice | 
| Mice Minute Virus use Minute virus of mice | 
| Mice, Athymic use Mice, Nude | 
| Mice, Biozzi | 
| Mice, Congenic | 
| Mice, Deer use Peromyscus | 
| Mice, Hairless use Mice, Inbred HRS | 
| Mice, House use Mice | 
| Mice, Inbred A | 
| Mice, Inbred AKR | 
| Mice, Inbred BALB C | 
| Mice, Inbred C3H | 
| Mice, Inbred C57BL | 
| Mice, Inbred CBA | 
| Mice, Inbred CFTR | 
| Mice, Inbred DBA | 
| Mice, Inbred HRS | 
| Mice, Inbred ICR | 
| Mice, Inbred ICRC use Mice, Inbred ICR | 
| Mice, Inbred MRL lpr | 
| Mice, Inbred NOD | 
| Mice, Inbred NZB | 
| Mice, Inbred SENCAR | 
| Mice, Inbred Strains | 
| Mice, Inbred mdx | 
| Mice, Jimpy | 
| Mice, Knockout | 
| Mice, Mutant Strains | 
| Mice, Neurologic Mutants | 
| Mice, Nude | 
| Mice, Obese | 
| Mice, Quaking | 
| Mice, Red-Backed use Arvicolinae | 
| Mice, SCID | 
| Mice, Transgenic | 
| Mice, White-Footed use Peromyscus | 
| Micellar Electrokinetic Capillary Chromatography use Chromatography, Micellar Electrokinetic Capillary | 
| Micelles | 
| Michigan | 
| Miconazole | 
| Miconia use Melastomataceae | 
| MicroRNAs | 
| Microabrasion, Dental use Enamel Microabrasion | 
| Microabrasion, Enamel use Enamel Microabrasion | 
| Microangiopathy, Diabetic use Diabetic Angiopathies | 
| Microarray Analysis | 
| Microarray Analysis of Gene Expression use Oligonucleotide Array Sequence Analysis | 
| Microbial Antagonism use Antibiosis | 
| Microbial Collagenase | 
| Microbial Degradation use Biodegradation, Environmental | 
| Microbial Sensitivity Tests | 
| Microbial Superinvasion use Superinfection | 
| Microbial Viability | 
| Microbicidal Cationic Proteins use Antimicrobial Cationic Peptides | 
| Microbicides use Anti-Infective Agents | 
| Microbicides, Local use Anti-Infective Agents, Local | 
| Microbicides, Topical use Anti-Infective Agents, Local | 
| Microbiologic Phenomena | 
| Microbiological Analysis | 
| Microbiological Techniques | 
| Microbiology | 
| Microbiome | 
| Microbiome, Human use Microbiome | 
| Microbodies | 
| Microbubbles | 
| Microcapsules use Capsules | 
| Microcebus use Cheirogaleidae | 
| Microcephaly | 
| Microchemistry | 
| Microchip Analytical Procedures | 
| Microchip Electrophoresis use Electrophoresis, Microchip | 
| Microcirculation | 
| Microcitrus use Rutaceae | 
| Microclimate | 
| Micrococcaceae | 
| Micrococcal Nuclease | 
| Micrococcus | 
| Micrococcus denitrificans use Paracoccus denitrificans | 
| Micrococcus luteus | 
| Micrococcus melitensis use Brucella melitensis | 
| Microcomputers | 
| Microcystins | 
| Microcystis | 
| Microcytotoxicity Tests use Cytotoxicity Tests, Immunologic | 
| Microdialysis | 
| Microdissection | 
| Microelectrodes | 
| Microencapsulation use Drug Compounding | 
| Microfibrils | 
| Microfilament Proteins | 
| Microfilaments | 
| Microfilaria | 
| Microfilming | 
| Microfiltration use Microstraining | 
| Microfluidic Analysis use Microfluidic Analytical Techniques | 
| Microfluidic Analytical Techniques | 
| Microfluidics | 
| Microfluorometry use Cytophotometry | 
| Microfluorometry, Flow use Flow Cytometry | 
| Microglia | 
| Micrognathism | 
| Micrographic Surgery, Mohs use Mohs Surgery | 
| Microgravity use Weightlessness | 
| Microgravity Simulation use Weightlessness Simulation | 
| Microinjections | 
| Microinterferometry use Microscopy, Interference | 
| Microirrigation use Trickling Irrigation | 
| Microlissencephaly use Microcephaly | 
| Micromanipulation | 
| Micromelum use Rutaceae | 
| Micromeria use Lamiaceae | 
| Micromeria douglasii | 
| Micromonospora | 
| Micromonosporaceae | 
| Micronesia | 
| Micronuclei, Chromosome-Defective | 
| Micronuclei, Germline use Micronucleus, Germline | 
| Micronucleus Assays use Micronucleus Tests | 
| Micronucleus Tests | 
| Micronucleus, Germline | 
| Micronutrients | 
| Microphthalmia-Associated Transcription Factor | 
| Microphthalmos | 
| Micropolyspora use Micromonosporaceae | 
| Micropore Filters | 
| Microprocessors use Microcomputers | 
| Micropsia use Vision Disorders | 
| Micropterus use Bass | 
| Micropunctures use Punctures | 
| Microradiography | 
| Microsatellite Instability | 
| Microsatellite Markers use Microsatellite Repeats | 
| Microsatellite Repeats | 
| Microscopic Angioscopy | 
| Microscopy | 
| Microscopy, Acoustic | 
| Microscopy, Atomic Force | 
| Microscopy, Confocal | 
| Microscopy, Confocal, Laser Scanning use Microscopy, Confocal | 
| Microscopy, Electron | 
| Microscopy, Electron Diffraction use Microscopy, Electron, Transmission | 
| Microscopy, Electron, Scanning | 
| Microscopy, Electron, Scanning Transmission | 
| Microscopy, Electron, Transmission | 
| Microscopy, Electron, X-Ray Microanalysis use Electron Probe Microanalysis | 
| Microscopy, Energy-Filtering Transmission Electron | 
| Microscopy, Fluorescence | 
| Microscopy, Fluorescence, Multiphoton | 
| Microscopy, Immunoelectron | 
| Microscopy, Immunofluorescence use Microscopy, Fluorescence | 
| Microscopy, Interference | 
| Microscopy, Phase-Contrast | 
| Microscopy, Polarization | 
| Microscopy, Polarized Light use Microscopy, Polarization | 
| Microscopy, Scanning Probe | 
| Microscopy, Scanning Tunneling | 
| Microscopy, Ultraviolet | 
| Microscopy, Video | 
| Microscreening use Microstraining | 
| Microsomal Triglyceride Transfer Protein Deficiency use Abetalipoproteinemia | 
| Microsomes | 
| Microsomes, Liver | 
| Microspectrophotometry | 
| Microspheres | 
| Microspikes, Cell Surface use Pseudopodia | 
| Microspora use Microsporidia | 
| Microspora Infections use Microsporidiosis | 
| Microsporea | 
| Microsporida | 
| Microsporidia | 
| Microsporidia, Unclassified | 
| Microsporidiosis | 
| Microsporidium use Microsporidia, Unclassified | 
| Microsporon use Microsporum | 
| Microsporum | 
| Microstomia | 
| Microstraining | 
| Microsurgery | 
| Microsurgical Revascularization, Cerebral use Cerebral Revascularization | 
| Microtinae use Arvicolinae | 
| Microtomy | 
| Microtrabecular Lattice use Cytoskeleton | 
| Microtubule Proteins | 
| Microtubule-Associated Proteins | 
| Microtubule-Organizing Center | 
| Microtubules | 
| Microtus use Arvicolinae | 
| Microvascular Angina | 
| Microvascular Permeability use Capillary Permeability | 
| Microvilli | 
| Microvillus use Microvilli | 
| Microviridae | 
| Microvirus | 
| Microwaves | 
| Microzonation | 
| Microzoning use Microzonation | 
| Micrurus use Elapidae | 
| Micturition use Urination | 
| Mid-Atlantic Region | 
| Mid-Upper Arm Circumference | 
| Midazolam | 
| Midbrain use Mesencephalon | 
| Midbrain Central Gray use Periaqueductal Gray | 
| Midbrain Hemorrhage, Traumatic use Brain Stem Hemorrhage, Traumatic | 
| Midbrain Neoplasms use Brain Stem Neoplasms | 
| Middle Aged | 
| Middle Atlantic States use Mid-Atlantic Region | 
| Middle Cerebral Artery | 
| Middle Cerebral Artery Embolus use Infarction, Middle Cerebral Artery | 
| Middle Cerebral Artery Infarction use Infarction, Middle Cerebral Artery | 
| Middle Cranial Fossa use Cranial Fossa, Middle | 
| Middle Ear Cholesteatoma use Cholesteatoma, Middle Ear | 
| Middle Ear Effusion use Otitis Media with Effusion | 
| Middle Ear Implant use Ossicular Prosthesis | 
| Middle Ear Ventilation | 
| Middle East | 
| Middle Lobe Syndrome | 
| Middle Promoters use Promoter Regions (Genetics) | 
| Middle West U.S. use Midwestern United States | 
| Midges, Biting use Ceratopogonidae | 
| Midges, Nonbiting use Chironomidae | 
| Midline Nuclear Group use Midline Thalamic Nuclei | 
| Midline Thalamic Nuclei | 
| Midodrine | 
| Midtrimester use Pregnancy Trimester, Second | 
| Midwest U.S. use Midwestern United States | 
| Midwestern United States | 
| Midwifery | 
| Midwives | 
| Midwives, Practical | 
| Mifepristone | 
| Mig Chemokine use Chemokine CXCL9 | 
| Migraine Disorders | 
| Migraine with Aura | 
| Migraine without Aura | 
| Migraine, Classic use Migraine with Aura | 
| Migraine, Common use Migraine without Aura | 
| Migrants use Transients and Migrants | 
| Migrating Motor Complex use Myoelectric Complex, Migrating | 
| Migration | 
| Migration Inhibition Factors, Macrophage use Macrophage Migration-Inhibitory Factors | 
| Migration Inhibitory Tests, Leukocyte use Cell Migration Assays, Leukocyte | 
| Migration Policy | 
| Migration Rate use Migration | 
| Migration, Animal use Animal Migration | 
| Migration, Cell use Cell Movement | 
| Migration-Inhibition Factors, Leukocyte use Leukocyte Migration-Inhibitory Factors | 
| Mikamycin | 
| Mikania | 
| Mikania amara use Guaco (Homeopathy) | 
| Mikulicz' Disease | 
| Mildew use Fungi | 
| Milesimal use Fifty Milesimal | 
| Milesimal Dilution use Fifty Milesimal | 
| Miliaria | 
| Miliaria Rubra use Miliaria | 
| Miliaria, Apocrine use Fox-Fordyce Disease | 
| Milieu Therapy | 
| Military Activities | 
| Military Anti-Shock Trousers use Gravity Suits | 
| Military Conflicts use Military Activities | 
| Military Dentistry | 
| Military Hygiene | 
| Military Medicine | 
| Military Nursing | 
| Military Occupations use Military Activities | 
| Military Personnel | 
| Military Psychiatry | 
| Military Psychology use Psychology, Military | 
| Military Science | 
| Military Veterinary Service use Veterinary Service, Military | 
| Milk | 
| Milk Banks | 
| Milk Ejection | 
| Milk Fever, Animal use Parturient Paresis | 
| Milk Hypersensitivity | 
| Milk Proteins | 
| Milk Sickness | 
| Milk Substitutes | 
| Milk Substitutes (Public Health) use Breast-Milk Substitutes | 
| Milk Substitutes, Human use Breast-Milk Substitutes | 
| Milk Thistle | 
| Milk Vetch use Astragalus Plant | 
| Milk, Human | 
| Milk, Soy use Soy Milk | 
| Milk-Alkali Syndrome use Hypercalcemia | 
| Milker's Nodes use Poxviridae Infections | 
| Milker's nodes virus use Pseudocowpox virus | 
| Milkweed, Common use Asclepias | 
| Milky, Creamy and Astringent Solutions use Beauty Lotions | 
| Millard-Gublar Syndrome use Brain Stem Infarctions | 
| Millefolium | 
| Millennium Development Goals | 
| Miller Fisher Syndrome | 
| Miller-Dieker Syndrome use Classical Lissencephalies and Subcortical Band Heterotopias | 
| Millet use Panicum | 
| Millet, Barnyard use Echinochloa | 
| Millet, Broomcorn use Panicum | 
| Millet, Common use Panicum | 
| Millet, Finger use Eleusine | 
| Millet, Foxtail use Setaria Plant | 
| Millet, German use Setaria Plant | 
| Millet, Indian Finger use Eleusine | 
| Millet, Italian use Setaria Plant | 
| Millet, Japanese use Echinochloa | 
| Millet, Kodo use Paspalum | 
| Millet, Koracan use Eleusine | 
| Millet, Little use Panicum | 
| Millet, Pearl use Pennisetum | 
| Millettia | 
| Milrinone | 
| Milroy's Disease use Lymphedema | 
| Mima use Acinetobacter | 
| Mimae Infections use Acinetobacter Infections | 
| Mimetic Muscles use Facial Muscles | 
| Mimetics, Biological use Biomimetics | 
| Mimetism use Adaptation, Biological | 
| Mimicry, Molecular use Molecular Mimicry | 
| Mimosa | 
| Mimosa humilis | 
| Mimosa pudica | 
| Mimosine | 
| Mimulus | 
| Mimusops | 
| Minamata Disease use Mercury Poisoning, Nervous System | 
| Mind Body and Relaxation Techniques use Mind-Body and Relaxation Techniques | 
| Mind-Body Relations (Metaphysics) | 
| Mind-Body Relations (Non-Physiology) use Mind-Body Relations (Metaphysics) | 
| Mind-Body Relations (Physiology) use Psychophysiology | 
| Mind-Body and Relaxation Techniques | 
| Mineral Acids use Inorganic Acids | 
| Mineral Deficiency | 
| Mineral Fibers | 
| Mineral Oil | 
| Mineral Particles use Inorganic Particles | 
| Mineral Waters | 
| Mineralocorticoid Excess Syndrome, Apparent | 
| Mineralocorticoid Receptors use Receptors, Mineralocorticoid | 
| Mineralocorticoids | 
| Mineralogy use Mining | 
| Minerals | 
| Mines use Mining | 
| Miniature Swine use Swine, Miniature | 
| Miniaturization | 
| Minibikes use Off-Road Motor Vehicles | 
| Minicomputers | 
| Minimal Access Surgical Procedures use Surgical Procedures, Minimally Invasive | 
| Minimal Brain Dysfunction use Attention Deficit Disorder with Hyperactivity | 
| Minimal Care Units use Self-Care Units | 
| Minimal Residual Disease use Neoplasm, Residual | 
| Minimal Surgical Procedures use Surgical Procedures, Minimally Invasive | 
| Minimally Conscious State use Persistent Vegetative State | 
| Minimally Invasive Surgical Procedures use Surgical Procedures, Minimally Invasive | 
| Minimum Inhibitory Concentration use Microbial Sensitivity Tests | 
| Minimum Temperature | 
| Mining | 
| Mining Acid Water | 
| Mining Industry use Mining | 
| Mining Wastes | 
| Minipigs use Swine, Miniature | 
| Minisatellite Repeats | 
| Ministerial Decree | 
| Mink | 
| Mink Cell Focus-Inducing Viruses | 
| Mink Encephalopathy Virus use Prions | 
| Mink Viral Enteritis | 
| Mink enteritis virus | 
| Minke Whale | 
| Minnesota | 
| Minnesota Multiphasic Personality Inventory use MMPI | 
| Minnows use Cyprinidae | 
| Minocycline | 
| Minor Histocompatibility Antigens | 
| Minor Histocompatibility Loci | 
| Minor Histocompatibility Peptides use Minor Histocompatibility Antigens | 
| Minor Lymphocyte Stimulatory Antigens | 
| Minor Lymphocyte Stimulatory Determinants use Minor Lymphocyte Stimulatory Antigens | 
| Minor Lymphocyte Stimulatory Loci | 
| Minor Planets | 
| Minor Surgery use Surgical Procedures, Minor | 
| Minority Groups | 
| Minority Health | 
| Minors | 
| Minoxidil | 
| Mint use Mentha | 
| Minute virus of mice | 
| Miocamycin | 
| Miokamycin use Miocamycin | 
| Miopithecus talapoin use Cercopithecidae | 
| Miosis | 
| Miosis, Innervational Defect use Horner Syndrome | 
| Miotics | 
| Mirabilis | 
| Miracle Fruit use Synsepalum | 
| Mires use Swamps | 
| Mirex | 
| Mirobalanus embilica use Phyllanthus emblica | 
| Mirounga use Seals, Earless | 
| Mirror Writing use Functional Laterality | 
| Mirza use Cheirogaleidae | 
| Miscarriage use Abortion, Spontaneous | 
| Miscarriage, Recurrent use Abortion, Habitual | 
| Misconduct, Professional use Professional Misconduct | 
| Misgurnus use Cypriniformes | 
| Mismatch Repair use DNA Mismatch Repair | 
| Misonidazole | 
| Misoprostol | 
| Missile Injuries, Penetrating, Head use Head Injuries, Penetrating | 
| Missions and Missionaries | 
| Missions, Official Medical use Medical Missions, Official | 
| Mississippi | 
| Missouri | 
| Mist use Fog (Environmental Health) | 
| Mist Catchment | 
| Mist Temperature use Dew Point Temperature | 
| Mistletoe | 
| Mistletoe, American use Phoradendron | 
| Mistletoe, European use Viscum album | 
| Misuse of Health Services use Health Services Misuse | 
| Misuse, Equipment use Equipment Failure | 
| Mitchella repens | 
| Mite Control use Tick Control | 
| Mite Infestations | 
| Mites | 
| Mites, House Dust use Pyroglyphidae | 
| Mites, Sheep Scab use Psoroptidae | 
| Mites, Spider use Tetranychidae | 
| Mites, Storage use Acaridae | 
| Mites, Store Product use Acaridae | 
| Mithramycin use Plicamycin | 
| Mitobronitol | 
| Mitochondria | 
| Mitochondria, Heart | 
| Mitochondria, Liver | 
| Mitochondria, Muscle | 
| Mitochondrial ADP, ATP Translocases | 
| Mitochondrial ATP Synthase use Mitochondrial Proton-Translocating ATPases | 
| Mitochondrial Contraction use Mitochondria | 
| Mitochondrial DNA use DNA, Mitochondrial | 
| Mitochondrial Diseases | 
| Mitochondrial Encephalomyopathies | 
| Mitochondrial Inheritance use Genes, Mitochondrial | 
| Mitochondrial Initiation Factors use Eukaryotic Initiation Factors | 
| Mitochondrial Membrane Transport Proteins | 
| Mitochondrial Membranes | 
| Mitochondrial Myopathies | 
| Mitochondrial Myopathy, Lactic Acidosis, Stroke-Like Episode use MELAS Syndrome | 
| Mitochondrial Ocular Myopathy use Ophthalmoplegia, Chronic Progressive External | 
| Mitochondrial Peptide Initiation Factors use Eukaryotic Initiation Factors | 
| Mitochondrial Proteins | 
| Mitochondrial Proton-Translocating ATPases | 
| Mitochondrial Size | 
| Mitochondrial Swelling | 
| Mitogen Receptors use Receptors, Mitogen | 
| Mitogen-Activated Protein Kinase 1 | 
| Mitogen-Activated Protein Kinase 10 | 
| Mitogen-Activated Protein Kinase 11 | 
| Mitogen-Activated Protein Kinase 12 | 
| Mitogen-Activated Protein Kinase 13 | 
| Mitogen-Activated Protein Kinase 14 | 
| Mitogen-Activated Protein Kinase 2 use Mitogen-Activated Protein Kinase 1 | 
| Mitogen-Activated Protein Kinase 3 | 
| Mitogen-Activated Protein Kinase 6 | 
| Mitogen-Activated Protein Kinase 7 | 
| Mitogen-Activated Protein Kinase 8 | 
| Mitogen-Activated Protein Kinase 9 | 
| Mitogen-Activated Protein Kinase Kinase Kinase 1 use MAP Kinase Kinase Kinase 1 | 
| Mitogen-Activated Protein Kinase Kinases | 
| Mitogen-Activated Protein Kinase Phosphatases | 
| Mitogen-Activated Protein Kinase p38 use p38 Mitogen-Activated Protein Kinases | 
| Mitogen-Activated Protein Kinases | 
| Mitogens | 
| Mitogens, Endogenous use Growth Substances | 
| Mitoguazone | 
| Mitolactol | 
| Mitomycin | 
| Mitomycin C use Mitomycin | 
| Mitomycins | 
| Mitosis | 
| Mitosis Modulators | 
| Mitosis-Promoting Factor use Maturation-Promoting Factor | 
| Mitosporic Fungi | 
| Mitotane | 
| Mitotic Apparatus use Mitotic Spindle Apparatus | 
| Mitotic Index | 
| Mitotic Spindle Apparatus | 
| Mitoxantrone | 
| Mitozantrone use Mitoxantrone | 
| Mitragyna | 
| Mitral Click-Murmur Syndrome use Mitral Valve Prolapse | 
| Mitral Incompetence use Mitral Valve Insufficiency | 
| Mitral Regurgitation use Mitral Valve Insufficiency | 
| Mitral Stenosis use Mitral Valve Stenosis | 
| Mitral Valve | 
| Mitral Valve Incompetence use Mitral Valve Insufficiency | 
| Mitral Valve Insufficiency | 
| Mitral Valve Prolapse | 
| Mitral Valve Stenosis | 
| Mix Flow Pumps | 
| Mix Zones | 
| Mixed Connective Tissue Disease | 
| Mixed Feeding | 
| Mixed Function Oxygenases | 
| Mixed Gonadal Dysgenesis use Gonadal Dysgenesis, Mixed | 
| Mixed Lymphocyte Culture Test use Lymphocyte Culture Test, Mixed | 
| Mixed Lymphocyte Reaction use Lymphocyte Culture Test, Mixed | 
| Mixed Salivary Gland Tumor use Adenoma, Pleomorphic | 
| Mixed Tumor, Malignant | 
| Mixed Tumor, Mesodermal | 
| Mixed Tumor, Mullerian | 
| Mixers | 
| Mixtures, Complex use Complex Mixtures | 
| Mls Antigens use Minor Lymphocyte Stimulatory Antigens | 
| Mls Determinants use Minor Lymphocyte Stimulatory Antigens | 
| Mls Loci use Minor Lymphocyte Stimulatory Loci | 
| MnATP use Adenosine Triphosphate | 
| Mnemiopsis use Ctenophora | 
| Mo1 Antigen use Antigens, CD11b | 
| Mobile Dispersed Genetic Elements use Retroelements | 
| Mobile Emergency Units use Ambulances | 
| Mobile Genetic Elements use Interspersed Repetitive Sequences | 
| Mobile Health Units | 
| Mobile Land Station | 
| Mobile Media in Emergency Cases | 
| Mobile Phone use Cellular Phone | 
| Mobile Plants | 
| Mobile Satellite Communication System use Mobile Satellite Communication System (Satcom) | 
| Mobile Satellite Communication System (Satcom) | 
| Mobile Source | 
| Mobile Units use Medicine-Dispensing Establishments | 
| Mobility Limitation | 
| Mobility Shift Assay use Electrophoretic Mobility Shift Assay | 
| Mobiluncus | 
| Mobiluncus curtisii use Mobiluncus | 
| Mobiluncus mulieris use Mobiluncus | 
| Mobius Syndrome | 
| Moclobemide | 
| Modalities, Alimentary | 
| Modalities, Appearance and Disappearance | 
| Modalities, Cosmological | 
| Modalities, Hourly | 
| Modalities, Meteorological | 
| Modalities, Moving | 
| Modalities, Periodical | 
| Modalities, Physiological | 
| Modalities, Place | 
| Modalities, Position | 
| Modalities, Secretion and Excretion | 
| Modalities, Sensorial | 
| Modalities, Symptomatic | 
| Modalization use Modalities, Symptomatic | 
| Modalized Symptoms use Modalities, Symptomatic | 
| Models, Anatomic | 
| Models, Animal | 
| Models, Biological | 
| Models, Cardiovascular | 
| Models, Chemical | 
| Models, Computer use Computer Simulation | 
| Models, Decision Support use Decision Support Techniques | 
| Models, Econometric | 
| Models, Economic | 
| Models, Educational | 
| Models, Genetic | 
| Models, Immunological | 
| Models, Linear use Linear Models | 
| Models, Logistic use Logistic Models | 
| Models, Molecular | 
| Models, Neural Network use Neural Networks (Computer) | 
| Models, Neurological | 
| Models, Nonlinear use Nonlinear Dynamics | 
| Models, Nursing | 
| Models, Organizational | 
| Models, Proportional Hazards use Proportional Hazards Models | 
| Models, Psychological | 
| Models, Space use Space Simulation | 
| Models, Statistical | 
| Models, Structural | 
| Models, Surgical use Models, Anatomic | 
| Models, Theoretical | 
| Models, Weightlessness use Weightlessness Simulation | 
| Modems | 
| Modern History use History, Modern 1601- | 
| Modernization of the Public Sector | 
| Modernization of the State use Modernization of the Public Sector | 
| Modernized Irrigation use Sprinkle Irrigation | 
| Modification Methylases use DNA Modification Methylases | 
| Modification Methylases (Adenine-Specific) use Site-Specific DNA-Methyltransferase (Adenine-Specific) | 
| Modification Methylases (Cytosine-Specific) use Site-Specific DNA Methyltransferase (Cytosine-Specific) | 
| Modification of Functioning Authorization | 
| Modification of Products Registration | 
| Modified Plant Fat use Vegetable Fats | 
| Modular Plants | 
| Moenomycins use Bambermycins | 
| Moersch-Woltmann Syndrome use Stiff-Person Syndrome | 
| Mohammedanism use Islam | 
| Mohr Syndrome use Orofaciodigital Syndromes | 
| Mohs Surgery | 
| Moire Topography | 
| Molar | 
| Molar Pregnancy use Hydatidiform Mole | 
| Molar, Fourth use Tooth, Supernumerary | 
| Molar, Third | 
| Molasses | 
| Moldavian S.S.R. use Moldova | 
| Molding Agents use Lubricants | 
| Moldova | 
| Molds use Fungi | 
| Mole Rats | 
| Mole, Skin use Nevus | 
| Molecular Biology | 
| Molecular Biology, Computational use Computational Biology | 
| Molecular Breeding use DNA Shuffling | 
| Molecular Chaperones | 
| Molecular Cloning use Cloning, Molecular | 
| Molecular Configuration use Molecular Conformation | 
| Molecular Conformation | 
| Molecular Cytogenetic Techniques use Cytogenetic Analysis | 
| Molecular Diagnostic Techniques | 
| Molecular Epidemiology use Epidemiology, Molecular | 
| Molecular Evolution use Evolution, Molecular | 
| Molecular Evolution, Directed use Directed Molecular Evolution | 
| Molecular Imprinting | 
| Molecular Mechanisms of Pharmacological Action | 
| Molecular Mimicry | 
| Molecular Models use Models, Molecular | 
| Molecular Motor Proteins | 
| Molecular Neurobiology use Neurobiology | 
| Molecular Oxygen Activated Sludges use Pure Oxygen Activated Sludges | 
| Molecular Probe Techniques | 
| Molecular Probes | 
| Molecular Sequence Data | 
| Molecular Stereochemistry use Molecular Conformation | 
| Molecular Structure | 
| Molecular Vaccines use Vaccines, Synthetic | 
| Molecular Weight | 
| Moles | 
| Molestation, Sexual, Child use Child Abuse, Sexual | 
| Molindone | 
| Mollicutes | 
| Molluginaceae | 
| Mollugo use Molluginaceae | 
| Mollusca | 
| Molluscacides | 
| Molluscipoxvirus | 
| Molluscum Contagiosum | 
| Molluscum contagiosum virus | 
| Mollusk Venoms | 
| Molly use Poecilia | 
| Moloney Leukemia Virus use Moloney murine leukemia virus | 
| Moloney Sarcoma Virus use Moloney murine sarcoma virus | 
| Moloney murine leukemia virus | 
| Moloney murine sarcoma virus | 
| Molsidomine | 
| Molteno Implants | 
| Molting | 
| Molting Hormone use Ecdysone | 
| Molybdenum | 
| Molybdenum-Iron Protein use Molybdoferredoxin | 
| Molybdoferredoxin | 
| Momordica | 
| Momordica balsamica | 
| Momordica charantia | 
| Momordica elaterium use Elaterium officinarum | 
| Momordica luffa use Luffa | 
| Monaco | 
| Monarda | 
| Monarda didyma | 
| Monascus | 
| Monckeberg Medial Calcific Sclerosis | 
| Monensin | 
| Mongolia | 
| Mongolian Spot | 
| Mongolism use Down Syndrome | 
| Mongoose, Brown-Tailed use Eupleridae | 
| Mongoose, Ring-Tailed use Eupleridae | 
| Mongooses use Herpestidae | 
| Monieziasis | 
| Monilia use Candida | 
| Monilia albicans | 
| Moniliasis use Candidiasis | 
| Moniliasis, Cutaneous use Candidiasis, Cutaneous | 
| Moniliasis, Oral use Candidiasis, Oral | 
| Moniliasis, Vulvovaginal use Candidiasis, Vulvovaginal | 
| Moniliformis | 
| Monimiaceae | 
| Monitoring | 
| Monitoring Networks | 
| Monitoring Stations | 
| Monitoring, Ambulatory | 
| Monitoring, Ambulatory Blood Pressure use Blood Pressure Monitoring, Ambulatory | 
| Monitoring, Ambulatory Electrocardiographic use Electrocardiography, Ambulatory | 
| Monitoring, Drug use Drug Monitoring | 
| Monitoring, Environmental use Environmental Monitoring | 
| Monitoring, Esophageal pH use Esophageal pH Monitoring | 
| Monitoring, Fetal use Fetal Monitoring | 
| Monitoring, Holter use Electrocardiography, Ambulatory | 
| Monitoring, Home Blood Glucose use Blood Glucose Self-Monitoring | 
| Monitoring, Immune use Monitoring, Immunologic | 
| Monitoring, Immunologic | 
| Monitoring, Intraoperative | 
| Monitoring, Outpatient use Monitoring, Ambulatory | 
| Monitoring, Physiologic | 
| Monitoring, Radioimmunologic use Monitoring, Immunologic | 
| Monitoring, Sleep use Polysomnography | 
| Monitors, Blood Pressure use Blood Pressure Monitors | 
| Monkey B Virus use Herpesvirus 1, Cercopithecine | 
| Monkey Diseases | 
| Monkey Hemorrhagic Disease Virus use Arterivirus | 
| Monkey Retroviruses use Retroviruses, Simian | 
| Monkey, African Green use Cercopithecus aethiops | 
| Monkey, Bonnet use Macaca radiata | 
| Monkey, Capuchin use Cebus | 
| Monkey, Colobus use Colobus | 
| Monkey, Crab-Eating use Macaca fascicularis | 
| Monkey, Cynomolgus use Macaca fascicularis | 
| Monkey, Green use Cercopithecus aethiops | 
| Monkey, Grivet use Cercopithecus aethiops | 
| Monkey, Howler use Alouatta | 
| Monkey, Japanese use Macaca | 
| Monkey, Night use Aotidae | 
| Monkey, Northern Night use Aotus trivirgatus | 
| Monkey, Owl use Aotidae | 
| Monkey, Patas use Erythrocebus patas | 
| Monkey, Pig-Tailed use Macaca nemestrina | 
| Monkey, Red use Erythrocebus patas | 
| Monkey, Rhesus use Macaca mulatta | 
| Monkey, Ring-Tail use Cebus | 
| Monkey, Spider use Atelinae | 
| Monkey, Squirrel use Saimiri | 
| Monkey, Talapoin use Cercopithecidae | 
| Monkey, Vervet use Cercopithecus aethiops | 
| Monkey, Woolly use Atelinae | 
| Monkeyflower use Mimulus | 
| Monkeypox | 
| Monkeypox virus | 
| Monkeys use Haplorhini | 
| Monkeys, New World use Platyrrhini | 
| Monkeys, Old World use Cercopithecidae | 
| Monkshood use Aconitum | 
| Mono(ADP-Ribose) Transferases use ADP Ribose Transferases | 
| Monoacylglycerol Lipases | 
| Monoacylglycerols use Monoglycerides | 
| Monoamine Oxidase | 
| Monoamine Oxidase Inhibitors | 
| Monoamine Transporters, Vesicular use Vesicular Monoamine Transport Proteins | 
| Monoamines, Biogenic use Biogenic Monoamines | 
| Monobactams | 
| Monoblastic Leukemia, Acute use Leukemia, Monocytic, Acute | 
| Monocarboxylic Acid Transport Proteins use Monocarboxylic Acid Transporters | 
| Monocarboxylic Acid Transporters | 
| Monochromatopsia use Color Vision Defects | 
| Monoclonal Antibodies use Antibodies, Monoclonal | 
| Monoclonal Antibody OKT3 use Muromonab-CD3 | 
| Monoclonal Gammopathies use Paraproteinemias | 
| Monoclonal Gammopathies, Benign | 
| Monocrotaline | 
| Monocrotophos | 
| Monocular Blindness, Transient use Amaurosis Fugax | 
| Monocular Vision use Vision, Monocular | 
| Monocyclic beta-Lactams use Monobactams | 
| Monocyte Chemoattractant Protein-1 use Chemokine CCL2 | 
| Monocyte Chemoattractant Proteins | 
| Monocyte Chemotactic Protein-1 use Chemokine CCL2 | 
| Monocyte Chemotactic Proteins use Monocyte Chemoattractant Proteins | 
| Monocyte-Derived Macrophages use Macrophages | 
| Monocytes | 
| Monocytes, Activated Killer | 
| Monocytic Leukemia, Acute use Leukemia, Monocytic, Acute | 
| Monodelphis | 
| Monoglyceride Esterases use Monoacylglycerol Lipases | 
| Monoglyceride Lipases use Monoacylglycerol Lipases | 
| Monoglycerides | 
| Monograph | 
| Monoiodotyrosine | 
| Monokines | 
| Monomeric Clathrin Assembly Proteins | 
| Monomeric G-Proteins use Monomeric GTP-Binding Proteins | 
| Monomeric GTP-Binding Proteins | 
| Monomethylhydrazine | 
| Monomycin use Erythromycin Ethylsuccinate | 
| Mononegavirales | 
| Mononegavirales Infections | 
| Mononeuritis use Mononeuropathies | 
| Mononeuropathies | 
| Mononeuropathy Multiplex use Mononeuropathies | 
| Mononeuropathy, Femoral use Femoral Neuropathy | 
| Mononuclear Leukocytes use Leukocytes, Mononuclear | 
| Mononuclear Phagocyte System | 
| Monooxygenases use Mixed Function Oxygenases | 
| Monophenol Monooxygenase | 
| Monophosphatidylglycerols use Phosphatidylglycerols | 
| Monoplegia use Hemiplegia | 
| Monoplegic Cerebral Palsy use Cerebral Palsy | 
| Monosaccharide Transport Proteins | 
| Monosaccharides | 
| Monosialosyl Tetraglycosyl Ceramide use G(M1) Ganglioside | 
| Monosodium Glutamate use Sodium Glutamate | 
| Monosomy | 
| Monosomy, Partial use Chromosome Deletion | 
| Monoterpenes | 
| Monotes use Dipterocarpaceae | 
| Monotremata | 
| Monotropa uniflora | 
| Monsonia ovata | 
| Monsoon Climate | 
| Monstera use Araceae | 
| Monsters | 
| Montana | 
| Montanoa | 
| Monte Carlo Method | 
| Monteggia's Fracture | 
| Montenegro | 
| Monthly Income use Income | 
| Montia use Portulacaceae | 
| Montmorillonite use Bentonite | 
| Montserrat use West Indies | 
| Mood use Affect | 
| Mood Disorders | 
| Mood Disorders, Psychotic use Affective Disorders, Psychotic | 
| Mood, Irritable use Irritable Mood | 
| Moon | 
| Moon Jellyfish use Scyphozoa | 
| Moonseed use Menispermum | 
| Mopeds use Motorcycles | 
| Mopidamol | 
| Moraceae | 
| Moracizin use Moricizine | 
| Moraea use Iridaceae | 
| Moral Complicity use Complicity | 
| Moral Damage | 
| Moral Development | 
| Moral Judgment, Retrospective use Retrospective Moral Judgment | 
| Moral Obligations | 
| Morale | 
| Morals | 
| Morantel | 
| Moraxella | 
| Moraxella (Branhamella) catarrhalis | 
| Moraxella (Moraxella) bovis | 
| Moraxella Infections use Moraxellaceae Infections | 
| Moraxella bovis use Moraxella (Moraxella) bovis | 
| Moraxella catarrhalis use Moraxella (Branhamella) catarrhalis | 
| Moraxella kingae use Kingella kingae | 
| Moraxellaceae | 
| Moraxellaceae Infections | 
| Morbid Metastasis | 
| Morbid Obesity use Obesity, Morbid | 
| Morbidity | 
| Morbidity Surveys | 
| Morbillinum | 
| Morbillivirus | 
| Morbillivirus Infections | 
| Morgagni-Stewart-Morel Syndrome use Hyperostosis Frontalis Interna | 
| Morganella | 
| Morganella morganii | 
| Moricizine | 
| Morinda | 
| Moringa | 
| Moringa oleifera | 
| Moritella | 
| Mormyrid use Electric Fish | 
| Mormyridae use Electric Fish | 
| Morning Sickness | 
| Morning-After Pill use Contraceptives, Postcoital | 
| Morocco | 
| Morone use Bass | 
| Moronidae use Bass | 
| Morphea use Scleroderma, Localized | 
| Morphinans | 
| Morphine | 
| Morphine Abuse use Morphine Dependence | 
| Morphine Addiction use Morphine Dependence | 
| Morphine Dependence | 
| Morphine Derivatives | 
| Morphine Receptors use Receptors, Opioid, mu | 
| Morphine Sulfate use Morphine | 
| Morphine Users use Morphine Dependence | 
| Morphinum | 
| Morphogenesis | 
| Morpholines | 
| Morphology | 
| Morquio's Disease use Mucopolysaccharidosis IV | 
| Morrhuate Sodium use Sodium Morrhuate | 
| Morsydomine use Molsidomine | 
| Mortality | 
| Mortality Rate | 
| Mortality Registries | 
| Mortality, Hospital use Hospital Mortality | 
| Mortierella | 
| Mortuary Customs use Funeral Rites | 
| Mortuary Practice | 
| Morula | 
| Morus | 
| Morvan Disease use Syringomyelia | 
| Mosaic Viruses | 
| Mosaicism | 
| Moschkowitz Disease use Purpura, Thrombotic Thrombocytopenic | 
| Moschus | 
| Moscow | 
| Mosquito Control | 
| Mosquito Fish use Cyprinodontiformes | 
| Mosquito-Borne Encephalitis use Encephalitis, Arbovirus | 
| Mosquitoes use Culicidae | 
| Moss Animals use Bryozoa | 
| Moss, Club use Lycopodiaceae | 
| Moss, Irish use Chondrus | 
| Moss, Sphagnum use Sphagnopsida | 
| Moss, Spike use Selaginellaceae | 
| Mossbauer Spectroscopy use Spectroscopy, Mossbauer | 
| Mosses, Granite use Bryophyta | 
| Mosses, Peat use Sphagnopsida | 
| Mosses, True use Bryopsida | 
| Mossy Fibers, Cerebellar use Nerve Fibers | 
| Mossy Fibers, Hippocampal | 
| Most Probable Number use Multiple Tube Method | 
| Moth Flies use Psychodidae | 
| Mother Cells use Stem Cells | 
| Mother Nutrition use Maternal Nutrition | 
| Mother Tincture | 
| Mother-Child Relations | 
| Mother-Fetus Relationship use Maternal-Fetal Relations | 
| Mothers | 
| Mothers, Gestational use Surrogate Mothers | 
| Mothers, Surrogate use Surrogate Mothers | 
| Motherwort use Leonurus | 
| Moths | 
| Motifs, Amino Acid use Amino Acid Motifs | 
| Motilin | 
| Motility Proteins use Molecular Motor Proteins | 
| Motility, Cell use Cell Movement | 
| Motion | 
| Motion Perception | 
| Motion Pictures use Motion Pictures as Topic | 
| Motion Pictures as Topic | 
| Motion Sickness | 
| Motion Therapy, Continuous Passive | 
| Motivation | 
| Motor Activity | 
| Motor Cortex | 
| Motor Endplate | 
| Motor Evoked Potentials use Evoked Potentials, Motor | 
| Motor Neuron Disease | 
| Motor Neuron Disease, Amyotrophic Lateral Sclerosis use Amyotrophic Lateral Sclerosis | 
| Motor Neuron Disease, Lower use Motor Neuron Disease | 
| Motor Neuron Disease, Upper use Motor Neuron Disease | 
| Motor Neurons | 
| Motor Neurons, Gamma | 
| Motor Partial Seizure Disorder use Epilepsy, Partial, Motor | 
| Motor Pathways use Efferent Pathways | 
| Motor Skills | 
| Motor Skills Disorders | 
| Motor Vehicles | 
| Motor Vehicles, Off-Road use Off-Road Motor Vehicles | 
| Motorbikes use Off-Road Motor Vehicles | 
| Motorcycles | 
| Mottled Enamel use Fluorosis, Dental | 
| Mouflon use Sheep, Domestic | 
| Moulages use Models, Anatomic | 
| Mounier-Kuhn Syndrome use Tracheobronchomegaly | 
| Mountain Ash use Sorbus | 
| Mountain Climate | 
| Mountain Lion use Puma | 
| Mountain Mahogany use Rosaceae | 
| Mountain Sickness use Altitude Sickness | 
| Mountaineering | 
| Mourning use Grief | 
| Mouse Cytomegalovirus use Muromegalovirus | 
| Mouse Elberfeld Virus use Maus Elberfeld virus | 
| Mouse Encephalomyelitis Virus use Maus Elberfeld virus | 
| Mouse Hepatitis Virus use Murine hepatitis virus | 
| Mouse Polioviruses use Theilovirus | 
| Mouse Sarcoma Viruses use Sarcoma Viruses, Murine | 
| Mouse Thymic Virus use Herpesviridae | 
| Mouse mammary tumor virus use Mammary Tumor Virus, Mouse | 
| Mousepox use Ectromelia, Infectious | 
| Mousepox virus use Ectromelia virus | 
| Mouth | 
| Mouth Abnormalities | 
| Mouth Breathing | 
| Mouth Cancer use Mouth Neoplasms | 
| Mouth Diseases | 
| Mouth Dryness use Xerostomia | 
| Mouth Floor | 
| Mouth Guards use Mouth Protectors | 
| Mouth Mucosa | 
| Mouth Neoplasms | 
| Mouth Protectors | 
| Mouth Rehabilitation | 
| Mouth Ulcer use Oral Ulcer | 
| Mouth, Edentulous | 
| Mouth-to-Mouth Resuscitation use Cardiopulmonary Resuscitation | 
| Mouthpieces, Protective use Mouth Protectors | 
| Mouthwashes | 
| Movement | 
| Movement Disorder Agents use Anti-Dyskinesia Agents | 
| Movement Disorder, Stereotypic use Stereotypic Movement Disorder | 
| Movement Disorders | 
| Movement Proteins, Viral, Plant use Plant Viral Movement Proteins | 
| Movement, Cell use Cell Movement | 
| Moving Bed | 
| Moving, Health Facility use Health Facility Moving | 
| Moxalactam | 
| Moxibustion | 
| Moxisylyte | 
| Moyamoya Disease | 
| Mozambique | 
| Muc1 Mucin use CA-15-3 Antigen | 
| Mucha-Habermann Disease use Pityriasis Lichenoides | 
| Mucinoses | 
| Mucinosis, Follicular | 
| Mucins | 
| Mucocele | 
| Mucociliary Clearance | 
| Mucociliary Transport use Mucociliary Clearance | 
| Mucocutaneous Lymph Node Syndrome | 
| Mucoepidermoid Tumor | 
| Mucolipidoses | 
| Mucolipidosis use Mucolipidoses | 
| Mucolytic Agents use Expectorants | 
| Mucopeptide Amidohydrolase use N-Acetylmuramoyl-L-alanine Amidase | 
| Mucopolysaccharides use Glycosaminoglycans | 
| Mucopolysaccharidoses | 
| Mucopolysaccharidosis I | 
| Mucopolysaccharidosis II | 
| Mucopolysaccharidosis III | 
| Mucopolysaccharidosis IV | 
| Mucopolysaccharidosis V use Mucopolysaccharidosis I | 
| Mucopolysaccharidosis VI | 
| Mucopolysaccharidosis VII | 
| Mucoproteins | 
| Mucor | 
| Mucor mucedo | 
| Mucorales | 
| Mucormycosis | 
| Mucosa use Mucous Membrane | 
| Mucosal Disease, Bovine Viral Diarrhea use Bovine Virus Diarrhea-Mucosal Disease | 
| Mucosal Immunity use Immunity, Mucosal | 
| Mucosal Tissue use Mucous Membrane | 
| Mucositis | 
| Mucotoxinum | 
| Mucous Membrane | 
| Mucoviscidosis use Cystic Fibrosis | 
| Mucuna | 
| Mucuna pruriens use Dolichos pruriens | 
| Mucuna urens | 
| Mucus | 
| Mud Baths use Mud Therapy | 
| Mud Therapy | 
| Muddy Salt Flats use Mangrove Swamps | 
| Mudflats use Mangrove Swamps | 
| Mudflow | 
| Mudminnows use Umbridae | 
| Mudpuppy use Necturus | 
| Mudslide use Mudflow | 
| Muerto Canyon Virus use Sin Nombre virus | 
| Mugwort use Artemisia | 
| Muira Puama use Olacaceae | 
| Mulberry use Morus | 
| Mules use Equidae | 
| Mulibrey Nanism | 
| Mullein use Verbascum | 
| Mullerian Ducts | 
| Mullerian-Inhibiting Hormone use Anti-Mullerian Hormone | 
| Mullets use Smegmamorpha | 
| Multi-Hospital Information Systems use Hospital Information Systems | 
| Multi-Hospital Systems use Multi-Institutional Systems | 
| Multi-Infarct Dementia use Dementia, Multi-Infarct | 
| Multi-Institutional Systems | 
| Multicenter Studies as Topic | 
| Multicenter Study | 
| Multicenter Trials use Multicenter Studies as Topic | 
| Multiculturalism use Cultural Diversity | 
| Multicystic Dysplastic Kidney | 
| Multidisciplinary Pain Centers use Pain Clinics | 
| Multidrug Resistance use Drug Resistance, Multiple | 
| Multidrug Resistance Gene use Genes, MDR | 
| Multidrug Resistance Protein 1 use P-Glycoprotein | 
| Multidrug Resistance Proteins use P-Glycoproteins | 
| Multidrug Resistance, Fungal use Drug Resistance, Multiple, Fungal | 
| Multidrug Resistance-Associated Protein use Multidrug Resistance-Associated Proteins | 
| Multidrug Resistance-Associated Proteins | 
| Multienzyme Complexes | 
| Multifaceted Agriculture use Sustainable Agriculture | 
| Multifactorial Causality use Causality | 
| Multifactorial Inheritance | 
| Multifunctional Agriculture use Sustainable Agriculture | 
| Multigene Family | 
| Multilingualism | 
| Multimedia | 
| Multimedia Technology use Multimedia | 
| Multimodal Treatment use Combined Modality Therapy | 
| Multinucleated Giant Cells use Giant Cells | 
| Multiparity use Parity | 
| Multiphasic Screening | 
| Multiphoton Fluorescence Microscopy use Microscopy, Fluorescence, Multiphoton | 
| Multiple Acyl Coenzyme A Dehydrogenase Deficiency | 
| Multiple Birth Offspring | 
| Multiple Carboxylase Deficiency | 
| Multiple Carboxylase Deficiency, Late-Onset use Biotinidase Deficiency | 
| Multiple Carboxylase Deficiency, Neonatal Form use Holocarboxylase Synthetase Deficiency | 
| Multiple Causation use Causality | 
| Multiple Cause of Death | 
| Multiple Chemical Sensitivity | 
| Multiple Endocrine Neoplasia | 
| Multiple Endocrine Neoplasia Type 1 | 
| Multiple Endocrine Neoplasia Type 2a | 
| Multiple Endocrine Neoplasia Type 2b | 
| Multiple Epiphyseal Dysplasia use Osteochondrodysplasias | 
| Multiple Hamartoma Syndrome use Hamartoma Syndrome, Multiple | 
| Multiple Myeloma | 
| Multiple Organ Dysfunction Syndrome use Multiple Organ Failure | 
| Multiple Organ Failure | 
| Multiple Personality Disorder | 
| Multiple Sclerosis | 
| Multiple Sclerosis, Acute Fulminating use Multiple Sclerosis | 
| Multiple Sclerosis, Acute Relapsing use Multiple Sclerosis, Relapsing-Remitting | 
| Multiple Sclerosis, Chronic Progressive | 
| Multiple Sclerosis, Progressive Relapsing use Multiple Sclerosis, Chronic Progressive | 
| Multiple Sclerosis, Relapsing-Remitting | 
| Multiple Sclerosis, Remittent Progressive use Multiple Sclerosis, Chronic Progressive | 
| Multiple Sulfatase Deficiency Disease | 
| Multiple System Atrophy | 
| Multiple Trauma | 
| Multiple Tube Method | 
| Multiple Tubes use Multiple Tube Method | 
| Multiplication-Stimulating Activity use Insulin-Like Growth Factor II | 
| Multipotent Stem Cells | 
| Multipotential Colony-Stimulating Factor use Interleukin-3 | 
| Multiprotein Complexes | 
| Multisectorial Action use Intersectorial Action | 
| Multivariate Analysis | 
| Mummichog use Fundulidae | 
| Mummies | 
| Mumps | 
| Mumps Vaccine | 
| Mumps virus | 
| Munc18 Proteins | 
| Munchausen Syndrome | 
| Munchausen Syndrome by Proxy | 
| Mung Bean Nuclease use Aspergillus Nuclease S1 | 
| Mungos use Herpestidae | 
| Municipal Environmental Plan | 
| Municipal Environmental Policy | 
| Municipal Government use Local Government | 
| Municipal Health Surveillance Centers | 
| Municipal Management | 
| Municipal Organization | 
| Municipalities use Cities | 
| Municipalization use Decentralization | 
| Muntiacus use Muntjacs | 
| Muntjacs | 
| Muons use Mesons | 
| Mupapillomavirus | 
| Mupirocin | 
| Mur-NAc-L-Ala-D-IsoGln use Acetylmuramyl-Alanyl-Isoglutamine | 
| Muramic Acids | 
| Muramidase | 
| Muramoylpentapeptide Carboxypeptidase | 
| Muramyl Dipeptide use Acetylmuramyl-Alanyl-Isoglutamine | 
| Murder use Homicide | 
| Murein use Peptidoglycan | 
| Murex purpureus | 
| Murexide | 
| Muriaticum Acidum | 
| Murid herpesvirus 1 use Muromegalovirus | 
| Murid herpesvirus 2 use Muromegalovirus | 
| Murid herpesvirus 3 use Herpesviridae | 
| Murid herpesvirus 4 use Rhadinovirus | 
| Muridae | 
| Murids use Muridae | 
| Murinae | 
| Murine AIDS use Murine Acquired Immunodeficiency Syndrome | 
| Murine Acquired Immunodeficiency Syndrome | 
| Murine Cytomegalovirus use Muromegalovirus | 
| Murine Encephalomyelitis Virus use Maus Elberfeld virus | 
| Murine Gastroenteritis Virus use Murine hepatitis virus | 
| Murine Polyomavirus use Polyomavirus | 
| Murine hepatitis virus | 
| Murine herpesvirus 68 use Rhadinovirus | 
| Murine leukemia virus use Leukemia Virus, Murine | 
| Murine pneumonia virus | 
| Muromegalovirus | 
| Muromonab-CD3 | 
| Murray Valley encephalitis virus use Encephalitis Virus, Murray Valley | 
| Murraya | 
| Murure leite | 
| Mus use Mice | 
| Mus musculus use Mice | 
| Musa | 
| Musa sapientum | 
| Musaceae | 
| Musanga use Cecropiaceae | 
| Musca autumnalis use Muscidae | 
| Musca domestica use Houseflies | 
| Muscari use Liliaceae | 
| Muscarine | 
| Muscarinic Acetylcholine Receptors use Receptors, Muscarinic | 
| Muscarinic Agents use Cholinergic Agents | 
| Muscarinic Agonists | 
| Muscarinic Antagonists | 
| Muscarinic Receptor M1 use Receptor, Muscarinic M1 | 
| Muscarinic Receptor M2 use Receptor, Muscarinic M2 | 
| Muscarinic Receptor M3 use Receptor, Muscarinic M3 | 
| Muscarinic Receptor M4 use Receptor, Muscarinic M4 | 
| Muscarinic Receptor M5 use Receptor, Muscarinic M5 | 
| Muscarinic Receptors use Receptors, Muscarinic | 
| Muscarinic Receptors M4 use Receptor, Muscarinic M4 | 
| Muscarinic Receptors M5 use Receptor, Muscarinic M5 | 
| Muscarinum | 
| Muscat and Oman use Oman | 
| Musci use Bryophyta | 
| Muscidae | 
| Muscimol | 
| Muscle Cancer use Muscle Neoplasms | 
| Muscle Cells | 
| Muscle Cells, Cardiac use Myocytes, Cardiac | 
| Muscle Cells, Embryonic use Myoblasts | 
| Muscle Cells, Heart use Myocytes, Cardiac | 
| Muscle Cells, Mature use Muscle Cells | 
| Muscle Contraction | 
| Muscle Cramp | 
| Muscle Denervation | 
| Muscle Development | 
| Muscle Disease Manifestations use Neuromuscular Manifestations | 
| Muscle Disorders use Muscular Diseases | 
| Muscle Dystonia use Dystonia | 
| Muscle Fatigue | 
| Muscle Fibers | 
| Muscle Fibers, Fast-Twitch | 
| Muscle Fibers, Intermediate use Muscle Fibers, Slow-Twitch | 
| Muscle Fibers, Red use Muscle Fibers, Fast-Twitch | 
| Muscle Fibers, Slow-Twitch | 
| Muscle Fibers, Type I use Muscle Fibers, Slow-Twitch | 
| Muscle Fibers, Type II use Muscle Fibers, Fast-Twitch | 
| Muscle Fibers, White use Muscle Fibers, Fast-Twitch | 
| Muscle Hypertonia | 
| Muscle Hypotonia | 
| Muscle Neoplasms | 
| Muscle Paresis use Paresis | 
| Muscle Proteins | 
| Muscle Relaxants, Central | 
| Muscle Relaxants, Depolarizing use Neuromuscular Depolarizing Agents | 
| Muscle Relaxants, Non-Depolarizing use Neuromuscular Nondepolarizing Agents | 
| Muscle Relaxation | 
| Muscle Rigidity | 
| Muscle Spasm use Spasm | 
| Muscle Spasticity | 
| Muscle Spindles | 
| Muscle Strength | 
| Muscle Strength Dynamometer | 
| Muscle Stretch Receptors use Muscle Spindles | 
| Muscle Stretching Exercises | 
| Muscle Tension use Muscle Tonus | 
| Muscle Tonus | 
| Muscle Weakness | 
| Muscle, Cardiac use Myocardium | 
| Muscle, Heart use Myocardium | 
| Muscle, Involuntary use Muscle, Smooth | 
| Muscle, Skeletal | 
| Muscle, Smooth | 
| Muscle, Smooth, Vascular | 
| Muscle, Striated | 
| Muscle, Voluntary use Muscle, Skeletal | 
| Muscles | 
| Muscular Atrophy | 
| Muscular Atrophy, Peroneal use Charcot-Marie-Tooth Disease | 
| Muscular Atrophy, Postpoliomyelitis use Postpoliomyelitis Syndrome | 
| Muscular Atrophy, Spinal | 
| Muscular Atrophy, Spinal, Infantile use Spinal Muscular Atrophies of Childhood | 
| Muscular Atrophy, Spinobulbar use Muscular Disorders, Atrophic | 
| Muscular Diseases | 
| Muscular Disorders, Atrophic | 
| Muscular Dystrophies | 
| Muscular Dystrophies, Limb-Girdle | 
| Muscular Dystrophy use Muscular Dystrophies | 
| Muscular Dystrophy, Animal | 
| Muscular Dystrophy, Becker use Muscular Dystrophy, Duchenne | 
| Muscular Dystrophy, Distal use Distal Myopathies | 
| Muscular Dystrophy, Duchenne | 
| Muscular Dystrophy, Emery-Dreifuss | 
| Muscular Dystrophy, Emery-Dreifuss, X-Linked use Muscular Dystrophy, Emery-Dreifuss | 
| Muscular Dystrophy, Facioscapulohumeral | 
| Muscular Dystrophy, Oculopharyngeal | 
| Muscular Dystrophy, Pseudohypertrophic use Muscular Dystrophy, Duchenne | 
| Muscular Hypertonicity use Muscle Hypertonia | 
| Muscularis Mucosae use Mucous Membrane | 
| Musculocutaneous Nerve | 
| Musculoskeletal Abnormalities | 
| Musculoskeletal Development | 
| Musculoskeletal Diseases | 
| Musculoskeletal Equilibrium | 
| Musculoskeletal Manipulations | 
| Musculoskeletal Physiologic Phenomena | 
| Musculoskeletal Physiologic Processes | 
| Musculoskeletal Physiological Phenomena use Musculoskeletal Physiologic Phenomena | 
| Musculoskeletal Physiological Processes use Musculoskeletal Physiologic Processes | 
| Musculoskeletal Physiology | 
| Musculoskeletal System | 
| Musculoskeletal, Neural, and Ocular Physiology | 
| Museums | 
| Mushroom Bodies | 
| Mushroom Poisoning | 
| Mushrooms use Agaricales | 
| Music | 
| Music Therapy | 
| Muskrats use Arvicolinae | 
| Muskroot use Adoxaceae | 
| Muslims use Islam | 
| Mussels use Bivalvia | 
| Mussels, Blue use Mytilus edulis | 
| Mussels, Common use Mytilus edulis | 
| Mussels, Native use Unionidae | 
| Mussels, Zebra use Dreissena | 
| Mustard use Mustard Plant | 
| Mustard Compounds | 
| Mustard Gas | 
| Mustard Plant | 
| Mustela lutreola use Mink | 
| Mustela macrodon use Mink | 
| Mustela putorius use Ferrets | 
| Mustela putorius furo use Ferrets | 
| Mustela vison use Mink | 
| Mustelidae | 
| Mustine use Mechlorethamine | 
| MutS DNA Mismatch-Binding Protein | 
| MutS Homolog 2 Protein | 
| Mutagen Screening use Mutagenicity Tests | 
| Mutagenesis | 
| Mutagenesis, Cassette use Mutagenesis, Insertional | 
| Mutagenesis, Insertional | 
| Mutagenesis, Oligonucleotide-Directed use Mutagenesis, Site-Directed | 
| Mutagenesis, Site-Directed | 
| Mutagenesis, Site-Specific use Mutagenesis, Site-Directed | 
| Mutagenic Dangers | 
| Mutagenic Teratogenic Substances, Products and Materials | 
| Mutagenicity Tests | 
| Mutagens | 
| Mutant Chimeric Proteins | 
| Mutant Proteins | 
| Mutases use Intramolecular Transferases | 
| Mutation | 
| Mutation, Frameshift use Frameshift Mutation | 
| Mutation, Germ-Line use Germ-Line Mutation | 
| Mutation, Missense | 
| Mutation, Nonsense use Codon, Nonsense | 
| Mutation, Point use Point Mutation | 
| Mutational Analysis, DNA use DNA Mutational Analysis | 
| Mutism | 
| Mutism, Akinetic use Akinetic Mutism | 
| Muzolimine | 
| Mya | 
| Myalgia, Epidemic use Pleurodynia, Epidemic | 
| Myanmar | 
| Myasthenia Gravis | 
| Myasthenia Gravis, Autoimmune, Experimental | 
| Myasthenia Gravis, Experimental Autoimmune use Myasthenia Gravis, Autoimmune, Experimental | 
| Myasthenia Gravis, Neonatal | 
| Myasthenic Syndrome, Lambert-Eaton use Lambert-Eaton Myasthenic Syndrome | 
| Myasthenic Syndromes, Congenital | 
| Myasthenic Syndromes, Congenital, Slow Channel use Myasthenic Syndromes, Congenital | 
| Mycelium | 
| Mycetoma use Maduromycosis | 
| Mycobacillin | 
| Mycobacteria, Atypical | 
| Mycobacteriaceae | 
| Mycobacterial Cervical Lymphadenitis use Tuberculosis, Lymph Node | 
| Mycobacteriophages | 
| Mycobacterium | 
| Mycobacterium Infections | 
| Mycobacterium Infections, Atypical | 
| Mycobacterium avium | 
| Mycobacterium avium Complex | 
| Mycobacterium avium subsp. paratuberculosis | 
| Mycobacterium avium-intracellulare use Mycobacterium avium Complex | 
| Mycobacterium avium-intracellulare Complex use Mycobacterium avium Complex | 
| Mycobacterium avium-intracellulare Infection | 
| Mycobacterium bovis | 
| Mycobacterium buruli use Mycobacterium ulcerans | 
| Mycobacterium chelonae | 
| Mycobacterium chelonei use Mycobacterium chelonae | 
| Mycobacterium duvalii use Mycobacteria, Atypical | 
| Mycobacterium flavescens use Mycobacteria, Atypical | 
| Mycobacterium fortuitum | 
| Mycobacterium gilvum use Mycobacteria, Atypical | 
| Mycobacterium gordonae use Mycobacteria, Atypical | 
| Mycobacterium haemophilum | 
| Mycobacterium intracellulare use Mycobacterium avium Complex | 
| Mycobacterium intracellulare Infection use Mycobacterium avium-intracellulare Infection | 
| Mycobacterium kansasii | 
| Mycobacterium leprae | 
| Mycobacterium lepraemurium | 
| Mycobacterium marinum | 
| Mycobacterium obuense use Mycobacteria, Atypical | 
| Mycobacterium paratuberculosis use Mycobacterium avium subsp. paratuberculosis | 
| Mycobacterium phlei | 
| Mycobacterium scrofulaceum | 
| Mycobacterium smegmatis | 
| Mycobacterium szulgai use Mycobacteria, Atypical | 
| Mycobacterium terrae use Mycobacteria, Atypical | 
| Mycobacterium tuberculosis | 
| Mycobacterium ulcerans | 
| Mycobacterium ulcerans Infection use Buruli Ulcer | 
| Mycobacterium xenopi | 
| Mycolic Acids | 
| Mycological Typing Techniques | 
| Mycology | 
| Mycophenolic Acid | 
| Mycoplasma | 
| Mycoplasma Infections | 
| Mycoplasma Pneumonia use Pneumonia, Mycoplasma | 
| Mycoplasma agalactiae | 
| Mycoplasma arthritidis | 
| Mycoplasma bovigenitalium | 
| Mycoplasma bovis | 
| Mycoplasma capricolum | 
| Mycoplasma conjunctivae | 
| Mycoplasma dispar | 
| Mycoplasma fermentans | 
| Mycoplasma gallisepticum | 
| Mycoplasma genitalium | 
| Mycoplasma hominis | 
| Mycoplasma hyopneumoniae | 
| Mycoplasma hyorhinis | 
| Mycoplasma hyosynoviae | 
| Mycoplasma incognitus use Mycoplasma fermentans | 
| Mycoplasma iowae | 
| Mycoplasma laidlawii use Acholeplasma laidlawii | 
| Mycoplasma meleagridis | 
| Mycoplasma mycoides | 
| Mycoplasma orale | 
| Mycoplasma ovipneumoniae | 
| Mycoplasma penetrans | 
| Mycoplasma pneumoniae | 
| Mycoplasma pulmonis | 
| Mycoplasma putrefaciens use Mycoplasma | 
| Mycoplasma salivarium | 
| Mycoplasma synoviae | 
| Mycoplasmal Pneumonia of Swine use Pneumonia of Swine, Mycoplasmal | 
| Mycoplasmataceae | 
| Mycoplasmatales | 
| Mycoplasmatales Infections | 
| Mycoreovirus use Reoviridae | 
| Mycorrhizae | 
| Mycorrhizae, Arbuscular use Mycorrhizae | 
| Mycorrhizae, Vesicular-Arbuscular use Mycorrhizae | 
| Mycoses | 
| Mycoses, Central Nervous System use Central Nervous System Fungal Infections | 
| Mycosis Fungoides | 
| Mycosis, Ocular use Eye Infections, Fungal | 
| Mycotic Aneurysm use Aneurysm, Infected | 
| Mycotic Aneurysm, Intracranial use Intracranial Aneurysm | 
| Mycotic Infections, Ocular use Eye Infections, Fungal | 
| Mycotoxicosis | 
| Mycotoxins | 
| Mydriasis | 
| Mydriatics | 
| Myelencephalon | 
| Myelin use Myelin Sheath | 
| Myelin Basic Proteins | 
| Myelin P0 Protein | 
| Myelin P2 Protein | 
| Myelin Proteins | 
| Myelin Proteolipid Protein | 
| Myelin Sheath | 
| Myelin-Associated Glycoprotein | 
| Myelinoclastic Diffuse Sclerosis use Diffuse Cerebral Sclerosis of Schilder | 
| Myelinolysis, Central Pontine | 
| Myelitis | 
| Myelitis, Transverse | 
| Myeloablative Agonists | 
| Myeloblastin | 
| Myeloblastosis Virus, Avian use Avian myeloblastosis virus | 
| Myeloblasts use Granulocyte Precursor Cells | 
| Myelocele use Meningomyelocele | 
| Myelocytic Leukemia use Leukemia, Myeloid | 
| Myelocytic Leukemia, Chronic use Leukemia, Myelogenous, Chronic, BCR-ABL Positive | 
| Myelodysplasia use Neural Tube Defects | 
| Myelodysplastic Syndromes | 
| Myelodysplastic-Myeloproliferative Diseases | 
| Myeloencephalitis use Encephalomyelitis | 
| Myelofibrosis | 
| Myelogenous Leukemia use Leukemia, Myeloid | 
| Myelogenous Leukemia, Chronic use Leukemia, Myelogenous, Chronic, BCR-ABL Positive | 
| Myelogenous Leukemia, Chronic, Aggressive Phase use Leukemia, Myeloid, Accelerated Phase | 
| Myelogenous Leukemia, Chronic, Chronic-Phase use Leukemia, Myeloid, Chronic-Phase | 
| Myelography | 
| Myeloid Cells | 
| Myeloid Differentiation Factor 88 | 
| Myeloid Differentiation-Inducing Protein use Interleukin-6 | 
| Myeloid Leukemia use Leukemia, Myeloid | 
| Myeloid Leukemia, Acute use Leukemia, Myeloid, Acute | 
| Myeloid Leukemia, Acute, M3 use Leukemia, Promyelocytic, Acute | 
| Myeloid Leukemia, Acute, M4 use Leukemia, Myelomonocytic, Acute | 
| Myeloid Leukemia, Acute, M5 use Leukemia, Monocytic, Acute | 
| Myeloid Leukemia, Acute, M6 use Leukemia, Erythroblastic, Acute | 
| Myeloid Leukemia, Acute, M7 use Leukemia, Megakaryoblastic, Acute | 
| Myeloid Leukemia, Chronic use Leukemia, Myelogenous, Chronic, BCR-ABL Positive | 
| Myeloid Leukemia, Chronic, Accelerated Phase use Leukemia, Myeloid, Accelerated Phase | 
| Myeloid Leukemia, Chronic, Aggressive Phase use Leukemia, Myeloid, Accelerated Phase | 
| Myeloid Leukemia, Chronic, Chronic-Phase use Leukemia, Myeloid, Chronic-Phase | 
| Myeloid Leukemia, Chronic, Stable-Phase use Leukemia, Myeloid, Chronic-Phase | 
| Myeloid Leukemia, Naegeli-Type use Leukemia, Myelomonocytic, Acute | 
| Myeloid Leukemia, Philadelphia-Negative use Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative | 
| Myeloid Leukemia, Schilling-Type use Leukemia, Monocytic, Acute | 
| Myeloid Metaplasia | 
| Myeloid Progenitor Cells | 
| Myeloid Sarcoma use Sarcoma, Myeloid | 
| Myeloid-Lymphoid Leukemia Protein | 
| Myelolipoma | 
| Myeloma Proteins | 
| Myeloma, Plasma-Cell use Multiple Myeloma | 
| Myelomeningocele use Meningomyelocele | 
| Myelomonocytic Differentiation Antigens use Antigens, Differentiation, Myelomonocytic | 
| Myelomonocytic Leukemia, Acute use Leukemia, Myelomonocytic, Acute | 
| Myelomonocytic Leukemia, Chronic use Leukemia, Myelomonocytic, Chronic | 
| Myelopathy use Spinal Cord Diseases | 
| Myelopathy, Compressive use Spinal Cord Compression | 
| Myelopathy, Inflammatory use Myelitis | 
| Myelopathy, Traumatic use Spinal Cord Injuries | 
| Myeloperoxidase use Peroxidase | 
| Myelopoiesis | 
| Myeloproliferative Disorders | 
| Myeloproliferative-Myelodisplastic Diseases use Myelodysplastic-Myeloproliferative Diseases | 
| Myelosclerosis use Myelofibrosis | 
| Myelosis, Nonleukemic use Myeloid Metaplasia | 
| Myelosyphilis use Tabes Dorsalis | 
| Myenteric Plexus | 
| Myers-Briggs Type Indicator use Personality Inventory | 
| Mygale lasiodora | 
| Myiasis | 
| Mynahs use Starlings | 
| Myo-Inositol 1,4,5-Trisphosphate use Inositol 1,4,5-Trisphosphate | 
| Myo-Inositol-1-Phosphate Synthase | 
| MyoD Protein | 
| Myoblastoma use Neoplasms, Muscle Tissue | 
| Myoblastoma, Granular Cell use Granular Cell Tumor | 
| Myoblasts | 
| Myoblasts, Cardiac | 
| Myoblasts, Skeletal | 
| Myoblasts, Smooth Muscle | 
| Myocardial Bridging | 
| Myocardial Contraction | 
| Myocardial Depressant Factor | 
| Myocardial Depressants use Anti-Arrhythmia Agents | 
| Myocardial Diseases use Cardiomyopathies | 
| Myocardial Diseases, Primary use Cardiomyopathies | 
| Myocardial Diseases, Secondary use Cardiomyopathies | 
| Myocardial Fractional Flow Reserve use Fractional Flow Reserve, Myocardial | 
| Myocardial Hibernation use Myocardial Stunning | 
| Myocardial Infarction | 
| Myocardial Ischemia | 
| Myocardial Mitochondria use Mitochondria, Heart | 
| Myocardial Preconditioning use Ischemic Preconditioning, Myocardial | 
| Myocardial Preinfarction Syndrome use Angina, Unstable | 
| Myocardial Remodeling, Ventricular use Ventricular Remodeling | 
| Myocardial Reperfusion | 
| Myocardial Reperfusion Injury | 
| Myocardial Revascularization | 
| Myocardial Stimulants use Cardiotonic Agents | 
| Myocardial Stunning | 
| Myocardiopathies use Cardiomyopathies | 
| Myocarditis | 
| Myocarditis, Chagas use Chagas Cardiomyopathy | 
| Myocardium | 
| Myoclonic Absence Epilepsy use Epilepsies, Myoclonic | 
| Myoclonic Cerebellar Dyssynergia | 
| Myoclonic Encephalopathy use Epilepsies, Myoclonic | 
| Myoclonic Epilepsies, Progressive | 
| Myoclonic Epilepsy use Epilepsies, Myoclonic | 
| Myoclonic Epilepsy with Ragged Red Fibers use MERRF Syndrome | 
| Myoclonic Epilepsy, Juvenile | 
| Myoclonus | 
| Myoclonus Cherry Red Spot Syndrome use Mucolipidoses | 
| Myoclonus, Action use Myoclonus | 
| Myoclonus, Nocturnal use Myoclonus | 
| Myoclonus, Palatal use Myoclonus | 
| Myocytes use Muscle Cells | 
| Myocytes, Cardiac | 
| Myocytes, Skeletal use Muscle Fibers | 
| Myocytes, Smooth Muscle | 
| Myodystrophia Fetalis Deformans use Arthrogryposis | 
| Myoelectric Complex, Migrating | 
| Myoepithelial Tumor use Myoepithelioma | 
| Myoepithelioma | 
| Myofacial Pain use Facial Pain | 
| Myofascial Pain Dysfunction Syndrome, Temporomandibular Joint use Temporomandibular Joint Dysfunction Syndrome | 
| Myofascial Pain Syndromes | 
| Myofibrillogenesis use Muscle Development | 
| Myofibrils | 
| Myofibroblastoma use Neoplasms, Muscle Tissue | 
| Myofibroma | 
| Myofibromatosis | 
| Myofilaments use Microfilaments | 
| Myofunctional Therapy | 
| Myogenesis use Muscle Development | 
| Myogenic Regulatory Factor 5 | 
| Myogenic Regulatory Factors | 
| Myogenin | 
| Myoglobin | 
| Myoglobinuria | 
| Myography | 
| Myoinositol use Inositol | 
| Myokinase use Adenylate Kinase | 
| Myokymia | 
| Myokymia, Continuous use Isaacs Syndrome | 
| Myoma | 
| Myometrial Contraction use Uterine Contraction | 
| Myometrium | 
| Myoneural Junction use Neuromuscular Junction | 
| Myopathies use Muscular Diseases | 
| Myopathies, Mitochondrial use Mitochondrial Myopathies | 
| Myopathies, Myotonic use Myotonic Disorders | 
| Myopathies, Nemaline | 
| Myopathies, Structural, Congenital | 
| Myopathy, Central Core | 
| Myopathy, Inclusion Body, Sporadic use Myositis, Inclusion Body | 
| Myopathy, Myotubular use Myopathies, Structural, Congenital | 
| Myopathy, Nemaline use Myopathies, Nemaline | 
| Myopathy, Rod use Myopathies, Nemaline | 
| Myopathy, Rod-Body use Myopathies, Nemaline | 
| Myophosphorylase use Glycogen Phosphorylase, Muscle Form | 
| Myopia | 
| Myopia, Degenerative | 
| Myopia, Pathological use Myopia, Degenerative | 
| Myopia, Progressive use Myopia, Degenerative | 
| Myoporaceae | 
| Myoporum | 
| Myosarcoma | 
| Myosin ATPase use Myosins | 
| Myosin Alkali Light Chains use Myosin Light Chains | 
| Myosin Heavy Chains | 
| Myosin I use Myosin Type I | 
| Myosin IA use Myosin Type I | 
| Myosin IB use Myosin Type I | 
| Myosin II use Myosin Type II | 
| Myosin IIB use Nonmuscle Myosin Type IIB | 
| Myosin III use Myosin Type III | 
| Myosin IV use Myosin Type IV | 
| Myosin Kinase use Myosin-Light-Chain Kinase | 
| Myosin Light Chains | 
| Myosin Rod use Myosin Subfragments | 
| Myosin S-1 use Myosin Subfragments | 
| Myosin S-2 use Myosin Subfragments | 
| Myosin Subfragments | 
| Myosin Type I | 
| Myosin Type II | 
| Myosin Type IIA, Non-Muscle use Nonmuscle Myosin Type IIA | 
| Myosin Type IIB, Non-Muscle use Nonmuscle Myosin Type IIB | 
| Myosin Type III | 
| Myosin Type IV | 
| Myosin Type V | 
| Myosin V use Myosin Type V | 
| Myosin-Light-Chain Kinase | 
| Myosin-Light-Chain Phosphatase | 
| Myosins | 
| Myosins, Atrial use Atrial Myosins | 
| Myosins, Cardiac use Cardiac Myosins | 
| Myosins, Smooth Muscle use Smooth Muscle Myosins | 
| Myositis | 
| Myositis Ossificans | 
| Myositis, Experimental Autoimmune use Nervous System Autoimmune Disease, Experimental | 
| Myositis, Focal use Myositis | 
| Myositis, Inclusion Body | 
| Myositis, Infectious use Myositis | 
| Myositis, Multiple use Polymyositis | 
| Myositis, Orbital use Granuloma, Plasma Cell, Orbital | 
| Myosotis arvensis | 
| Myosotis symphytifolia | 
| Myotonia | 
| Myotonia Congenita | 
| Myotonia Fluctuans use Myotonic Disorders | 
| Myotonia, Generalized, Becker use Myotonia Congenita | 
| Myotonic Disorders | 
| Myotonic Dystrophy | 
| Myotonic Dystrophy, Congenital use Myotonic Dystrophy | 
| Myotonic Myopathy, Proximal use Myotonic Disorders | 
| Myotonic Periodic Paralysis use Paralysis, Hyperkalemic Periodic | 
| Myotubes use Muscle Fibers | 
| Myoviridae | 
| Myoxidae | 
| Myrianthus use Urticaceae | 
| Myrica | 
| Myrica cerifera | 
| Myricaceae | 
| Myricaria germanica use Tamarix germanica | 
| Myringoplasty | 
| Myristate use Myristic Acid | 
| Myristates | 
| Myristic Acid | 
| Myristic Acids | 
| Myristica fragrans | 
| Myristica sebifera | 
| Myristicaceae | 
| Myrmecophagidae use Xenarthra | 
| Myrobalans use Terminalia | 
| Myroxylon | 
| Myroxylon balsamum use Myroxylon | 
| Myrrh, Bisabol use Commiphora | 
| Myrrha | 
| Myrsinaceae | 
| Myrtaceae | 
| Myrtle use Myrtus | 
| Myrtle, Bog use Myrica | 
| Myrtus | 
| Myrtus cheken | 
| Myrtus communis | 
| Myrtus pimenta | 
| Mystery Swine Disease use Porcine Reproductive and Respiratory Syndrome | 
| Mysticism | 
| Mythology | 
| Mytilidae | 
| Mytilus | 
| Mytilus edulis | 
| Myxedema | 
| Myxedema, Congenital use Congenital Hypothyroidism | 
| Myxicola use Polychaeta | 
| Myxobacterales use Myxococcales | 
| Myxobacteria use Myxococcales | 
| Myxococcales | 
| Myxococcus | 
| Myxococcus xanthus | 
| Myxofibroma use Fibroma | 
| Myxoid Cyst use Ganglion Cysts | 
| Myxoma | 
| Myxoma virus | 
| Myxoma, Nerve Sheath use Neurothekeoma | 
| Myxomatosis Virus use Myxoma virus | 
| Myxomatosis, Infectious | 
| Myxomycetes | 
| Myxomycota use Myxomycetes | 
| Myxophyta use Cyanobacteria | 
| Myxosarcoma | 
| Myxovirus influenzae-A hominis use Influenza A virus | 
| Myxovirus influenzae-A suis use Influenza A virus | 
| Myxovirus parotitidis use Mumps virus | 
| Myxovirus pestis galli use Influenza A virus | 
| Myxoviruses use Orthomyxoviridae | 
| Myzus use Aphids | 
| m-AMSA use Amsacrine | 
| m-Dihydroxybenzenes use Resorcinols | 
| m-Hydroxynorephedrine use Metaraminol | 
| mRNA use RNA, Messenger | 
| mRNA Cleavage and Polyadenylation Factors | 
| mRNA Decay use RNA Stability | 
| mRNA Differential Display use Gene Expression Profiling | 
| mRNA Leader Sequences use 5' Untranslated Regions | 
| mRNA Transcript Degradation use RNA Stability | 
| mRNA, Non-Polyadenylated use RNA, Messenger | 
| mRNA, Polyadenylated use RNA, Messenger | 
| maf Oncogene Protein use Oncogene Protein v-maf | 
| maf Proto-Oncogene Protein use Proto-Oncogene Proteins c-maf | 
| met Proto-Oncogene Proteins use Proto-Oncogene Proteins c-met | 
| meta-Dihydroxybenzenes use Resorcinols | 
| meta-Hydroxynorephedrine use Metaraminol | 
| miRNA use MicroRNAs | 
| mil-raf Protein Kinases use raf Kinases | 
| mos Genes use Genes, mos | 
| mos Oncogene Proteins use Oncogene Proteins v-mos | 
| mos Proto-Oncogene Proteins use Proto-Oncogene Proteins c-mos | 
| mtDNA use DNA, Mitochondrial | 
| mu Phage use Bacteriophage mu | 
| mu Receptors use Receptors, Opioid, mu | 
| mu-Adaptin use Adaptor Protein Complex mu Subunits | 
| mu-Chain Disease use Heavy Chain Disease | 
| mu-Conotoxins use Conotoxins | 
| mu-Mesons use Mesons | 
| myb Genes use Genes, myb | 
| myb Oncogene Proteins use Oncogene Proteins v-myb | 
| myb Proto-Oncogene Proteins use Proto-Oncogene Proteins c-myb | 
| myc Genes use Genes, myc | 
| myc Oncogene Protein p55 use Oncogene Protein p55(v-myc) | 
| myc Proto-Oncogene Proteins use Proto-Oncogene Proteins c-myc |