GDNF GI:4503975 glial cell derived neurotrophic factor isoform 1 preproprotein 1 mklwdvvavc lvllhtasaf plpagkrppe apaedrslgr rrapfalssd 50 51 snmpedypdq fddvmdfiqa tikrlkrspd kqmavlprre rnrqaaaanp 100 101 ensrgkgrrg qrgknrgcvl taihlnvtdl glgyetkeel ifrycsgscd 150 151 aaettydkil knlsrnrrlv sdkvgqaccr piafdddlsf lddnlvyhil 200 201 rkhsakrcgc i