>2f1fB (B:) observed residues (from ATOM records)
arrilsvllenesgalsrviglfsqrgyniesltvaptddptlsrmtiqtvgdekvleqi
ekqlhklvdvlrvselgqgahvereimlvkiqasgygrdevkrnteifrgqiidvtpsly
tvqlagtsgkldaflasirdvakivevarsgvvglsrg