>4r69B (B:) observed residues (from ATOM records)
atlkdqliynllkeeqtpqnkitvvgvgavgmacaisilmkdladelalvdviedklkge
mmdlqhgslflrtpkivsgkdynvtansklviitagarlnlvqrnvnifkfiipnvvkys
pnckllivsnpvdiltyvawkisgfpknrvigsgcnldsarfrylmgerlgvhplschgw
vlgehgdssvpvwsgmnvagvslktlhpdlgtdkdkeqwkevhkqvvesayeviklkgyt
swaiglsvadlaesimknlrrvhpvstmikglygikddvflsvpcilgqngisdlvkvtl
tseeearlkksadtlwgiqkelqf