Immunogen sequence: YNDVPVTEGV VYIEQLPEQI VIPFTDQVAC LKENEQSKEN EQSPRVSPKS VVEKTTSGMS KKSVESVKLA QLEENAKYSS VYMEAEATAL LSD Highest antigen sequence identity to the following orthologs: Mouse - 58%, Rat - 56%. Spermatozoa gain fertilization capacitation a