>1xbtA (A:) observed residues (from ATOM records) rgqiqvilgpmfsgkstelmrrvrrfqiaqykclvikyakdtralpacllrdvaqealgv avigidegqffpdivefceamanagktvivaaldgtfqrkpfgailnlvplaesvvklta vcmecfreaaytkrlgtekeveviggadkyhsvcrlcyfk