SNX3 GI:23111041 sorting nexin 3 isoform b 1 maetvadtrr litkpqnlnd aygppsnfle idvsnpqtvg vgrgrfttye 50 51 irvkvvvppl pgkaflrqlp frgddgifdd nfieerkqgl eqfinkvagh 100 101 plaqnerclh mflqdeiidk sytpskirha