| A - ANATOMY 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| A01 - BODY REGIONS 
 
 
 
 | 
| B - ORGANISMS 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| B01 - INVERTEBRATES 
 B02 - VERTEBRATES
 
 B04 - VIRUSES
 
 B06 - PLANTS
 
 
 
 
 | 
| C - DISEASES 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| C02 - VIRUS DISEASES 
 C10 - NERVOUS SYSTEM DISEASES
 
 C16 - CONGENITAL, HEREDITARY, AND NEONATAL DISEASES AND ABNORMALITIES
 
 C17 - SKIN AND CONNECTIVE TISSUE DISEASES
 
 C18 - NUTRITIONAL AND METABOLIC DISEASES
 
 
 
 
 | 
| D - CHEMICALS AND DRUGS 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| D02 - ORGANIC CHEMICALS 
 D06 - HORMONES, HORMONE SUBSTITUTES, AND HORMONE ANTAGONISTS
 
 D08 - ENZYMES, COENZYMES, AND ENZYME INHIBITORS
 
 D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS
 
 
 
 
 | 
| E - ANALYTICAL, DIAGNOSTIC AND THERAPEUTIC TECHNIQUES AND EQUIPMENT 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| E01 - DIAGNOSIS 
 E02 - THERAPEUTICS
 
 
 
 
 | 
| N - HEALTH CARE 
 | Deleted term |  | Concept absorbed by | 
 
 | 
| N03 - HEALTH CARE ECONOMICS AND ORGANIZATIONS 
 
 
 
 |