>1keyB (B:) observed residues (from ATOM records)
fatmsvseifvelqgflaaeqdireeirkvvqsleqtareiltllqgvhqgtgfqdipkr
clkarehfstvkthltslktkfpaeqyyrfhehwrfvlqrlvflaafvvyletetlvtre
avteilgiepdrekgfhldvedylsgvlilaselsrlsvnsvtagdysrplhistfinel
dsgfrllnlkndslrkrydglkydvkkveevvydlsirgfn