================================================ PRotein Ontology (PRO) Release 20.0, version 0 27-June-2011 The Protein Ontology Consortium--Protein Information Resource, The Jackson Laboratory, Reactome, and the Department of Philosophy at the State University of New York at Buffalo--is pleased to announce PRO Release 20.0 (25-May-2011). PRO describes the relationships of proteins and protein evolutionary classes, delineates the multiple protein forms of a gene locus (ontology for protein forms), protein complexes, and interconnects existing ontologies. Further information is available at http://pir.georgetown.edu/pro/. In PRO Release 20.0, version 0: There are 27275 PRO terms 4 terms are in the 'organism-family' category. 304 terms are in the 'family' category. 18205 terms are in the 'gene' category. 1373 terms are in the 'sequence' category. 5926 terms are in the 'modification' category. 99 terms are in the 'complex' category. 435 terms are in the 'organism-gene' category. 380 terms are in the 'organism-sequence' category. 260 terms are in the 'organism-modification' category. 168 terms are in the 'organism-complex' category. 9 terms are in the 'union' category. 1559 terms have some kind of annotation, codifying the information from 1047 papers. 2321 connections to GO (788 PRO terms). 374 connections to MOD (327 PRO terms). 604 connections to Pfam (362 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 GO, MOD, CHEBI, and SO ontologies that are used for logical definitions. If using OBO Edit to view PRO, please turn on the reasoner in order to display the hierarchy. _Current changes_ None. ================================================