Immunogen sequence: ASQHSYPLNR FSSVPLDPME RPMSQADLEL DYNPPRVQLS DEMFVFQDGR WVNENCRLQS PYFSPSASFH HKLHHK Highest antigen sequence identity to the following orthologs: Mouse - 89%, Rat - 93%. SPERT (spermatid associated protein), also known as CBY2 (chibby