[Term] id: PR:000035726 name: ubiquitin (UBB) def: "A polyubiquitin-B that has been processed by proteolytic cleavage to produce a protein consisting of a Ubiquitin (Pfam:PF00240) domain. There are three copies of ubiquitin in polyubiquitin B. Example: UniProtKB:P0CG47, (1-76) or (77-152) or (153-228)." [PRO:CNA] comment: Category=modification. synonym: "UBB/Clv:ubiq" EXACT PRO-short-label [PRO:DAN] is_a: PR:000030443 ! polyubiquitin-B relationship: output_of GO:0016485 ! protein processing