UBE2B GI:4507771 ubiquitin-conjugating enzyme E2B 1 mstparrrlm rdfkrlqedp pvgvsgapse nnimqwnavi fgpegtpfed 50 51 gtfklviefs eeypnkpptv rflskmfhpn vyadgsicld ilqnrwspty 100 101 dvssiltsiq slldepnpns pansqaaqly qenkreyekr vsaiveqswn 150 151 ds