PRotein Ontology (PRO) Release 44.0 (05-Jan-2015) There are 223166 PRO terms in the Protein Ontology. 54 terms are in the 'external' category. 352 terms are in the 'family' category. 23580 terms are in the 'gene' category. 8301 terms are in the 'sequence' category. 6656 terms are in the 'modification' category. 214 terms are in the 'complex' category. 15 terms are in the 'organism-family' category. 114939 terms are in the 'organism-gene' category. 66900 terms are in the 'organism-sequence' category. 1533 terms are in the 'organism-modification' category. 372 terms are in the 'organism-complex' category. 33 terms are in the 'union' category. 2401 terms have some kind of annotation, codifying the information from 1576 papers. 4319 connections to GO (1527 PRO terms). 374 connections to MOD (330 PRO terms). 621 connections to Pfam (374 PRO terms). 338 connections to SO (317 PRO terms). 349 annotations of a phenotype (342 PRO terms). The ontology includes a subset of terms from other ontologies and resources that are used for logical definitions. _Current changes_ 1) The content from the promapping.obo file has been merged with the pro.obo file. _Ongoing_ 1) Continue to add shorthand labels to terms. 2) Resolve names and synonym duplicates.