>sp|Q9NS25|SPNXB_HUMAN Sperm protein associated with the nucleus on the X chromosome B1 OS=Homo sapiens GN=SPANXB1 MGQQSSVRRLKRSVPCESNEANEANEANKTMPETPTGDSDPQPAPKKMKTSESSTILVVR YRRNVKRTSPEELLNDHARENRINPDQMEEEEFIEITTERPKK