Immunogen sequence: GQQQRITFSE TGAEEEEEND QLPLVHCVVA RSEKSGLLQE PLAGGPLSNL SENTCDNFCL VLEAIQENLR QYKEIRD Highest antigen sequence identity to the following orthologs: Mouse - 62%, Rat - 71%. CatSper4, is a protein which in humans is encoded by the CATSPE