PRotein Ontology (PRO) Release 28.0 (23-Jul-2012)

There are 28804 PRO terms
   315 terms are in the 'family' category.
  18285 terms are in the 'gene' category.
  1546 terms are in the 'sequence' category.
  6178 terms are in the 'modification' category.
   126 terms are in the 'complex' category.
    4 terms are in the 'organism-family' category.
   875 terms are in the 'organism-gene' category.
   592 terms are in the 'organism-sequence' category.
   523 terms are in the 'organism-modification' category.
   236 terms are in the 'organism-complex' category.
   12 terms are in the 'union' category.
1679 terms have some kind of annotation, codifying the information from 1170 papers.
  2449 connections to GO (870 PRO terms).
   374 connections to MOD (327 PRO terms).
   605 connections to Pfam (362 PRO terms).
   338 connections to SO (317 PRO terms).
   344 annotations of a phenotype (337 PRO terms).

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