>gi|73765546 ubiquitin-conjugating enzyme E2 variant 1 isoform d [Homo sapiens] MAATTGSGVKVPRNFRLLEELEEGQKGVGDGTVSWGLEDDEDMTLTRWTG MIIGPPRTIYENRIYSLKIECGPKYPEAPPFVRFVTKINMNGVNSSNGVV DPRAISVLAKWQNSYSIKVVLQELRRLMMSKENMKLPQPPEGQCYSN