PRotein Ontology (PRO) Release 25.0 (20-Dec-2011)

There are 28332 PRO terms
    4 terms are in the 'organism-family' category.
   314 terms are in the 'family' category.
  18274 terms are in the 'gene' category.
  1429 terms are in the 'sequence' category.
  6101 terms are in the 'modification' category.
   114 terms are in the 'complex' category.
   855 terms are in the 'organism-gene' category.
   450 terms are in the 'organism-sequence' category.
   442 terms are in the 'organism-modification' category.
   225 terms are in the 'organism-complex' category.
   12 terms are in the 'union' category.
1598 terms have some kind of annotation, codifying the information from 1089 papers.
  2389 connections to GO (828 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.