Immunogen sequence: LPQPQFLSPD VLMPTMAGEP NRLPGTSRSV QQFLAMCDRG ETSQGAKYTG RTLNYQSLPH RSRTDNSWAP WSETNQHIGT RFLTTPGCNP QLTYTATLPE RSK Highest antigen sequence identity to the following orthologs: Mouse - 82%, Rat - 82%. USP54 has no peptidase activity.