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Amino Acids, Peptides, and Proteins
(4 sub-categories)
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Anesthesia and Analgesia
(8 sub-categories)
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Animal Diseases
(45 sub-categories)
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Animal Structures
(50 sub-categories)
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Archaea
(4 sub-categories)
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Bacteria
(17 sub-categories)
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Bacterial Structures
(10 sub-categories)
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Behavior and Behavior Mechanisms
(15 sub-categories)
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Behavioral Disciplines and Activities
(10 sub-categories)
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Biological Factors
(15 sub-categories)
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Biological Phenomena
(23 sub-categories)
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Biomedical and Dental Materials
(12 sub-categories)
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Body Regions
(12 sub-categories)
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Carbohydrates
(13 sub-categories)
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Cardiovascular Diseases
(5 sub-categories)
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Cardiovascular System
(10 sub-categories)
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Cell Physiological Phenomena
(41 sub-categories)
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Cells
(36 sub-categories)
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Chemical Actions and Uses
(3 sub-categories)
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Chemical Phenomena
(40 sub-categories)
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Chemically-Induced Disorders
(2 sub-categories)
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Circulatory and Respiratory Physiological Phenomena
(3 sub-categories)
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Complex Mixtures
(19 sub-categories)
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Congenital, Hereditary, and Neonatal Diseases and Abnormalities
(4 sub-categories)
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Dentistry
(33 sub-categories)
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Diagnosis
(12 sub-categories)
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Digestive System
(4 sub-categories)
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Digestive System and Oral Physiological Phenomena
(2 sub-categories)
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Digestive System Diseases
(8 sub-categories)
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Disorders of Environmental Origin
(2 sub-categories)
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Education
(17 sub-categories)
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Embryonic Structures
(29 sub-categories)
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Endocrine System
(3 sub-categories)
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Endocrine System Diseases
(11 sub-categories)
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Environment and Public Health
(3 sub-categories)
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Enzymes and Coenzymes
(4 sub-categories)
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Equipment and Supplies
(58 sub-categories)
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Eukaryota
(19 sub-categories)
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Eye Diseases
(26 sub-categories)
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Fluids and Secretions
(9 sub-categories)
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Food and Beverages
(4 sub-categories)
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Fungal Structures
(5 sub-categories)
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Genetic Phenomena
(47 sub-categories)
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Geographic Locations
(11 sub-categories)
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Health Care Economics and Organizations
(10 sub-categories)
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Health Care Facilities Workforce and Services
(9 sub-categories)
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Health Care Quality, Access, and Evaluation
(6 sub-categories)
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Health Occupations
(26 sub-categories)
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Health Services Administration
(5 sub-categories)
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Hemic and Immune Systems
(3 sub-categories)
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Hemic and Lymphatic Diseases
(2 sub-categories)
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Heterocyclic Compounds
(7 sub-categories)
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Hormones, Hormone Substitutes, and Hormone Antagonists
(2 sub-categories)
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Human Activities
(17 sub-categories)
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Humanities
(13 sub-categories)
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Immune System Diseases
(11 sub-categories)
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Immune System Phenomena
(34 sub-categories)
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Infections
(36 sub-categories)
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