Anatomy|A|319770
Organisms|B|227410
Diseases|C|473233
Chemicals and Drugs|D|846981
Analytical, Diagnostic and Therapeutic Techniques and Equipment|E|735240
Psychiatry and Psychology|F|167445
Biological Sciences|G|870765
Physical Sciences|H|314685
Anthropology, Education, Sociology and Social Phenomena|I|110640
Technology and Food and Beverages|J|35949
Humanities|K|28745
Information Science|L|129289
Persons|M|356342
Health Care|N|478688
Geographic Locations|Z|88910

Body Regions|A01|12523
Musculoskeletal System|A02|31422
Digestive System|A03|17937
Respiratory System|A04|7984
Urogenital System|A05|17011
Endocrine System|A06|7736
Cardiovascular System|A07|27660
Nervous System|A08|57255
Sense Organs|A09|8976
Tissues|A10|30575
Cells|A11|130697
Fluids and Secretions|A12|9257
Animal Structures|A13|4331
Stomatognathic System|A14|10275
Hemic and Immune Systems|A15|34171
Embryonic Structures|A16|8617
Integumentary System|A17|3786
Invertebrates|B01|19961
Vertebrates|B02|132900
Bacteria|B03|28659
Viruses|B04|19233
Algae and Fungi|B05|9321
Plants|B06|22101
Archaea|B07|741
Bacterial Infections and Mycoses|C01|29426
Virus Diseases|C02|21544
Parasitic Diseases|C03|7172
Neoplasms|C04|99760
Musculoskeletal Diseases|C05|19649
Digestive System Diseases|C06|39890
Stomatognathic Diseases|C07|11997
Respiratory Tract Diseases|C08|24688
Otorhinolaryngologic Diseases|C09|6826
Nervous System Diseases|C10|60902
Eye Diseases|C11|11787
Urologic and Male Genital Diseases|C12|20545
Female Genital Diseases and Pregnancy Complications|C13|18110
Cardiovascular Diseases|C14|57513
Hemic and Lymphatic Diseases|C15|16275
Congenital, Hereditary, and Neonatal Diseases and Abnormalities|C16|21209
Skin and Connective Tissue Diseases|C17|18600
Nutritional and Metabolic Diseases|C18|23818
Endocrine Diseases|C19|23924
Immunologic Diseases|C20|31652
Disorders of Environmental Origin|C21|29604
Animal Diseases|C22|11827
Pathological Conditions, Signs and Symptoms|C23|101832
Inorganic Chemicals|D01|59832
Organic Chemicals|D02|83810
Heterocyclic Compounds|D03|54966
Polycyclic Hydrocarbons|D04|22369
Environmental Pollutants, Noxae, and Pesticides|D05|16053
Hormones, Hormone Substitutes, and Hormone Antagonists|D06|29085
Reproductive Control Agents|D07|2272
Enzymes, Coenzymes, and Enzyme Inhibitors|D08|98575
Carbohydrates and Hypoglycemic Agents|D09|31932
Lipids and Antilipemic Agents|D10|29273
Growth Substances, Pigments, and Vitamins|D11|19054
Amino Acids, Peptides, and Proteins|D12|260297
Nucleic Acids, Nucleotides, and Nucleosides|D13|61982
Neurotransmitters and Neurotransmitter Agents|D14|30770
Central Nervous System Agents|D15|12925
Peripheral Nervous System Agents|D16|5823
Anti-Inflammatory Agents, Antirheumatic Agents, and Inflammation Mediators|D17|12524
Cardiovascular Agents|D18|7468
Hematologic, Gastrointestinal, and Renal Agents|D19|5793
Anti-Infective Agents|D20|17031
Anti-Allergic and Respiratory System Agents|D21|1509
Antineoplastic and Immunosuppressive Agents|D22|13929
Dermatologic Agents|D23|1018
Immunologic and Biological Factors|D24|122463
Biomedical and Dental Materials|D25|14190
Specialty Chemicals and Products|D26|48065
Chemical Actions and Uses|D27|126428
Diagnosis|E01|169229
Therapeutics|E02|86135
Anesthesia and Analgesia|E03|4747
Surgical Procedures, Operative|E04|70847
Investigative Techniques|E05|441887
Dentistry|E06|14156
Equipment and Supplies|E07|23847
Behavior and Behavior Mechanisms|F01|83827
Psychological Phenomena and Processes|F02|46485
Mental Disorders|F03|26309
Behavioral Disciplines and Activities|F04|19540
Biological Sciences|G01|24056
Health Occupations|G02|34170
Environment and Public Health|G03|298177
Biological Phenomena, Cell Phenomena, and Immunity|G04|96629
Genetic Processes|G05|64488
Biochemical Phenomena, Metabolism, and Nutrition|G06|151507
Physiological Processes|G07|58086
Reproductive and Urinary Physiology|G08|31877
Circulatory and Respiratory Physiology|G09|31748
Digestive, Oral, and Skin Physiology|G10|5359
Musculoskeletal, Neural, and Ocular Physiology|G11|62593
Chemical and Pharmacologic Phenomena|G12|42796
Genetic Phenomena|G13|59230
Genetic Structures|G14|52873
Natural Sciences|H01|314685
Social Sciences|I01|75705
Education|I02|26189
Human Activities|I03|8880
Technology, Industry, and Agriculture|J01|21109
Food and Beverages|J02|14840
Humanities|K01|28745
Information Science|L01|129289
Persons|M01|356342
Population Characteristics|N01|52428
Health Care Facilities, Manpower, and Services|N02|77936
Health Care Economics and Organizations|N03|58384
Health Services Administration|N04|98610
Health Care Quality, Access, and Evaluation|N05|275332
Geographic Locations|Z01|88910