ubiquitin-conjugating enzyme E2 B [Bos taurus]
MSTPARRRLM RDFKRLQEDP PVGVSGAPSE NNIMQWNAVI FGPEGTPFED GTFKLVIEFS
EEYPNKPPTV RFLSKMFHPN VYADGSICLD ILQNRWSPTY DVSSILTSIQ SLLDEPNPNS
PANSQAAQLY QENKREYEKR VSAIVEQSWN DS