>1xbtE (E:) observed residues (from ATOM records)
rgqiqvilgpmfsgkstelmrrvrrfqiaqykclvikyakdtralpacllrdvaqealgv
avigidegqffpdivefceamanagktvivaaldgtfqrkpfgailnlvplaesvvklta
vcmecfreaaytkrlgtekeveviggadkyhsvcrlcyfk