Immunogen sequence: LSCEISLLKS ECHRVKMQRA GLQNELFFAF SVSSLDTEKG PKRCTDHNCE PYKRLFKAKN LIERFFNQQV EILG Highest antigen sequence identity to the following orthologs: Mouse - 84%, Rat - 84%. ZPBP (also known as ZPBP1), named for its binding to the oocyte zo