Immunogen sequence: HMKEKFSKKL ASSSFIRLTL ELKARFCSGL SHSALNQVCS NFLYYMCLNL LSAPEKTGPP SKEELSAVSE LLQHGLPQIS SRS Highest antigen sequence identity to the following orthologs: Mouse - 86%, Rat - 81%. The predominant cause of spermatogenic arrest of meiosis