Immunogen sequence: MPSEVSEVLS VGGRWTPDLE ITSSQPLDGQ EDKLLHVSSL DTPQRSYGDL SPPCSNWVET GLEVSLTTDE LLYPSPKAGK EVSGHSELLG SLPASS Highest antigen sequence identity to the following orthologs: Mouse - 68%, Rat - 68%. Specifically required during spermatogenes