>2f1rB (B:) observed residues (from ATOM records)
lilsivgtssgkttlitrmmpilrerglrvavvkrhadswkiynsgadvviaspvklafi
rrvseeegndldwiyerylsdydlvitegfskagkdrivvvkkpeevehfrqgrilavvc
dervdghkwfrrdeveriaefilsll