• J Translation, ribosomal structure and biogenesis
• A RNA processing and modification
• K Transcription
• L Replication, recombination and repair
• B Chromatin structure and dynamics
• D Cell cycle control, cell division, chromosome partitioning
• Y Nuclear structure
• V Defense mechanisms
• T Signal transduction mechanisms
• M Cell wall/membrane/envelope biogenesis
• N Cell motility
• Z Cytoskeleton
• W Extracellular structures
• U Intracellular trafficking, secretion, and vesicular transport
• O Posttranslational modification, protein turnover, chaperones
• 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
• R General function prediction only
• S Function unknown