SPAG11B GI:7706551 sperm associated antigen 11B isoform A preproprotein 1 mrqrllpsvt slllvallfp gssqarhvnh satealgelr erapgqgtng 50 51 fqllrhavkr dllpprtppy qvhishrear gpsfricvdf lgprwargcs 100 101 tgn