I Small Molecule Metabolism
 I.A Amino acid biosynthesis
  I.A.1 leucine
  I.A.2 isoleucine/valine
  I.A.3 alanine
  I.A.4 histidine
  I.A.5 chorismate
  I.A.6 tryptophan
  I.A.7 tyrosine
  I.A.8 phenylalanine
  I.A.9 cysteine
  I.A.10 serine
  I.A.11 glycine
  I.A.12 methionine
  I.A.12 threonine
  I.A.13 lysine
  I.A.14 asparagine
  I.A.15 aspartate
  I.A.16 proline
  I.A.17 arginine
  I.A.18 glutamine
  I.A.19 glutamate
 I.B Biosynthesis of cofactors, carriers
  I.B.1 fatty acid and phosphatidic acid biosynthesis
  I.B.2 enterochelin
  I.B.3 cobalamin
  I.B.4 heme, porphyrin
  I.B.5 menaquinone, ubiquinone
  I.B.6 thioredoxin, glutaredoxin, glutathione
  I.B.7 riboflavin
  I.B.8 thiamin
  I.B.9 pyridine nucleotide
  I.B.10 pyridoxine
  I.B.11 pantothenate
  I.B.12 molybdopterin
  I.B.13 lipoate
  I.B.14 folic acid
  I.B.15 biotin
  I.B.16 acyl carrier protein (ACP)
  I.B.17 biotin carboxyl carrier protein (BCCP)
 I.C Fatty acid biosynthesis
 I.D Nucleotide biosynthesis
  I.D.1 pyrimidine ribonucleotide biosynthesis
  I.D.2 purine ribonucleotide biosynthesis
 I.E Global functions
  I.E.1 global regulatory functions
  I.E.2 ATP-proton motive force interconversion
 I.F Central intermediary metabolism
  I.F.1 salvage of nucleosides and nucleotides
  I.F.2	2-prime-deoxyribonucleotide metabolism
  I.F.3 sulfur metabolism
  I.F.4 misc. glucose metabolism
  I.F.5 nitrogen metabolism
  I.F.6 nitrogen fixation
  I.F.7 oligosaccharides
  I.F.8 amino sugars
  I.F.9 nucleotide interconversions
  I.F.10 sugar-nucleotide biosynthesis, conversions
  I.F.11 misc. glycerol metabolism
  I.F.12 nucleotide hydrolysis
  I.F.13 gluconeogenesis
  I.F.14 amino acids
  I.F.15 polyamine biosynthesis
  I.F.16 Entner-Doudoroff
  I.F.17 glyoxylate bypass
  I.F.18 pool of unassigned individual reversibles reactions
  I.F.19 non oxidative branch, pentose pathway
  I.F.20 phosphorus metabolism
 I.G Energy transfer
  I.G.1 electron transport
 I.H Energy metabolism, carbon
  I.H.1 fermentation
  I.H.2 anaerobic respiration
  I.H.3 aerobic respiration
  I.H.4 oxidative branch, pentose pathway
  I.H.6 TCA cycle
  I.H.7 pyruvate dehydrogenase
  I.H.8 glycolysis
 I.I Degradation
  I.I.1 fatty acid
  I.I.2 amines
  I.I.3 amino acids
  I.I.4 carbon compounds
II MACROMOLECULE METABOLISM
 II.A Macromolecule degradation
  II.A.1 degradation of DNA
  II.A.2 degradation of RNA
  II.A.3 degradation of polysaccharides
  II.A.4 degradation of proteins, peptides, glycopeptides
 II.B Macromolecule synthesis, modification
  II.B.1 phospholipides
  II.B.2 lipopolysaccharides
  II.B.3 glycoproteins
  II.B.4 lipoproteins
  II.B.5 polysaccharides - (cytoplasmic)
  II.B.6 RNA synthesis, modification , DNA transcription
  II.B.7 proteins and peptides - translation and modification
  II.B.8 DNA - replication, repair, restr./modif.
 II.C Basic proteins
  II.C.1 basic proteins - synthesis, modification
 II.D aa-tRNAs
  II.D.1 amino acyl tRNA synthesis; tRNA modification
  II.D.2 tRNA
III STRUCTURAL ELEMENTS
 III.A Cell Exterior
  III.A.1 surface polysaccharides/antigens
  III.A.2 surface structures
 III.B Cell envelope
  III.B.1 membrane, inner
  III.B.2 membrane, outer
  III.B.3 murein sacculus, peptidoglycan
 III.C Ribosome constituents
  III.C.1 ribosomes - maturation and modification
  III.C.2 ribosomal proteins - synthesis, modification
  III.C.3 ribosomal and stable RNAs
IV CELL PROCESSES
 IV.A Cell division
 IV.B Chaperoning
 IV.C Mobility chemotaxis
 IV.D Transport of small molecules
  IV.D.1 anions
  IV.D.2 amino acids, amines
  IV.D.3 carbohydrates, organic acids, alcohols
  IV.D.4 cations
  IV.D.5 incorporation metal ions
  IV.D.6 nucleosides, purines pyrimidines
  IV.D.7 other transport
 IV.E Transport of large molecules
  IV.E.1 uptake of DNA
  IV.E.2 protein, peptide secretion
 IV.F Adaptation
  IV.F.1 adaptations, atypical conditions
  IV.F.2 osmotic adaptation
 IV.G Protection responses
  IV.G.1 radiation sensitivity
  IV.G.2 drug/analog sensitivity
  IV.G.3 cell killing
  IV.G.4 detoxification
 IV.H Nodulation
V ELEMENTS OF EXTERNAL ORIGIN
 V.A Transposon-related functions
 V.B Plasmid-related functions Non-bacterial functions
 V.C Colicin-related functions Non-bacterial functions
 V.D Phage-related functions and prophages
VI MISCELLANEOUS
 VI.A Not classified regulator
 VI.B Hypothetical/Partial homology
 VI.C Hypothetical/Global homology
 VI.E Virulence
 VI.D Unknown