Immunogen sequence: STEPESAQIQD SPMNNLMESG SGEPRSEAPE SSESWKPEQL GEGSVPDGPG NQSIELSRPA EEAAVITEAG DQGMVSVGPE GAGELLAQVQ KDIQPAPSAE ELAEQLDLGE EASALLLEDG EAPAS Highest antigen sequence identity to the following orthologs - mouse 45%, rat 44%. E3 ubiquitin