>2ckfB (B:) observed residues (from ATOM records)
qvpvtpdvhyaveahyraevrllqtgqyrewlhgmvaedihywmpiyeqrfvrdrrpdpt
pddaaiynddfeelkqrverlysgqvwmedppskiryfvsnveafeaengeldvlsnilv
yrnrrqtevtvhtlgredklrqdgngfkvfrrklildarvtqdknlyffc