>1a50B (B:) observed residues (from ATOM records)
ttllnpyfgefggmyvpqilmpalnqleeafvraqkdpefqaqfadllknyagrptaltk
cqnitagtrttlylkredllhggahktnqvlgqallakrmgkseiiaetgagqhgvasal
asallglkcriymgakdverqspnvfrmrlmgaevipvhsgsatlkdacnealrdwsgsy
etahymlgtaagphpyptivrefqrmigeetkaqildkegrlpdaviacvgggsnaigmf
adfindtsvgligvepgghgietgehgaplkhgrvgiyfgmkapmmqtadgqieesysis
agldfpsvgpqhaylnsigradyvsitddealeafktlcrhegiipalesshalahalkm
mreqpekeqllvvnlsgrgdkdiftvhdil