| Information storage and processing |
| [J] Translation, ribosomal structure and biogenesis |
| [A] RNA processing and modification |
| [K] Transcription |
| [L] Replication, recombination and repair |
| Cellular processes and signaling |
| [D] Cell cycle control, cell division, chromosome partitioning |
| [V] Defense mechanisms |
| [T] Signal transduction mechanisms |
| [M] Cell wall/membrane/envelope biogenesis |
| [N] Cell motility |
| [U] Intracellular trafficking, secretion, and vesicular transport |
| [O] Posttranslational modification, protein turnover, chaperones |
| Metabolism |
| [C] Energy production and conversion |
| [G] Carbohydrate transport and metabolism |
| [E] Amino acid transport and metabolism |
| [F] Nucleotide transport and metabolism |
| [H] Coenzyme transport and metabolism |
| [I] Lipid transport and metabolism |
| [P] Inorganic ion transport and metabolism |
| [Q] Secondary metabolites biosynthesis, transport and catabolism |
| Poorly characterized |
| [R] General function prediction only |
| [S] Function unknown |
| Unannotated |
