PRotein Ontology (PRO) Release 26.0 (23-Feb-2012)

There are 28452 PRO terms
    4 terms are in the 'organism-family' category.
   314 terms are in the 'family' category.
  18274 terms are in the 'gene' category.
  1460 terms are in the 'sequence' category.
  6127 terms are in the 'modification' category.
   116 terms are in the 'complex' category.
   864 terms are in the 'organism-gene' category.
   475 terms are in the 'organism-sequence' category.
   468 terms are in the 'organism-modification' category.
   226 terms are in the 'organism-complex' category.
   12 terms are in the 'union' category.
1609 terms have some kind of annotation, codifying the information from 1097 papers.
  2405 connections to GO (839 PRO terms).
   374 connections to MOD (327 PRO terms).
   604 connections to Pfam (361 PRO terms).
   338 connections to SO (317 PRO terms).
   306 annotations of a phenotype (299 PRO terms).

The ontology includes a subset of terms from other ontologies and resources that are used for logical definitions.