Information storage and processing
J:Translation, ribosomal structure and biogenesis 
A:RNA processing and modification 
K:Transcription 
L:Replication, recombination and repair 
B:Chromatin structure and dynamics 

Cellular processes and signaling
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 

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 
