SPA17 GI:8394343 sperm autoantigenic protein 17 1 msipfsnthy ripqgfgnll egltreilre qpdnipafaa ayfesllekr 50 51 ektnfdpaew gskvedrfyn nhafeeqepp eksdpkqees qisgkeeets 100 101 vtildsseed kekeevaavk iqaafrghia reeakkmktn slqneekeen 150 151 k