FXN GI:239787198 frataxin isoform 3 preproprotein 1 mwtlgrrava gllaspspaq aqtltrvprp aelaplcgrr glrtdidatc 50 51 tprrassnqr glnqiwnvkk qsvylmnlrk sgtlghpgsl dettyerlae 100 101 etldslaeff edladkpytf edydvsfgsg vltvklggdl gtyvinkqtp 150 151 nkqiwlssps rltwllwlfh p