BDNF GI:219842306 brain-derived neurotrophic factor isoform a preproprotein 1 mtilfltmvi syfgcmkaap mkeanirgqg glaypgvrth gtlesvngpk 50 51 agsrgltsla dtfehvieel ldedqkvrpn eennkdadly tsrvmlssqv 100 101 pleppllfll eeyknyldaa nmsmrvrrhs dparrgelsv cdsisewvta 150 151 adkktavdms ggtvtvlekv pvskgqlkqy fyetkcnpmg ytkegcrgid 200 201 krhwnsqcrt tqsyvraltm dskkrigwrf iridtscvct ltikrgr