SPAG11B GI:17402931 sperm associated antigen 11B isoform C preproprotein 1 mrqrllpsvt slllvallfp gssqarhvnh satealgelr erapgqgtng 50 51 fqllrhavkr dllpprtppy qepasdlkvv dcrrsegfcq eycnymetqv 100 101 gycskkkdac clh