IGF1 GI:11024682 insulin-like growth factor 1 isoform 4 preproprotein 1 mgkisslptq lfkccfcdfl kvkmhtmsss hlfylalcll tftssatagp 50 51 etlcgaelvd alqfvcgdrg fyfnkptgyg sssrrapqtg ivdeccfrsc 100 101 dlrrlemyca plkpaksars vraqrhtdmp ktqkevhlkn asrgsagnkn 150 151 yrm