| | Categories | Description | Examples | MeSH Tree IDs |
| | E (entities) | Genes and proteins | MCM, protein, ORC, Skp2 | D06, D08, D12, and D23.529 | | F (function) | Biological function or process | Regulation, pathway, and function | G, F01, F02 | | D (dependency) | Relationship type | Involve, cause | N/A | | X (characteristic) | Modifier | Unstable, common, and ionizing | N/A | | L (location) | Cellular or molecular part | C-terminal, cytosol, and motif | A | | S (species) | Any taxonomic description | Human, mammal, and S. cerevisiae | B | | T (time) | Temporal information | During, after, and following | N/A | | M (exp methods) | Methods and their components | Recombination, transfect | E | | H (chemicals) | Not including genes/proteins | DNA, thymidine, and phosphoryl | D (except: D06, D08, D12, and D23.529) | | R (disorders) | Names and associated terms | Cancer, tumor, and patient | C, F03 | | Special Types: | | | | | IDs with subtypes | Subtype of a BASIC type | Retain-change, common-distinct | | | IDs with opposite | Opposite of a BASIC type | Cell cycle—G phase, CDK–CDK2 | | | Complex IDs | Combination of BASIC types | Radio-resistant DNA synthesis | |
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