>1b56A (A:) observed residues (from ATOM records) tvqqlegrwrlvdskgfdeymkelgvgialrkmgamakpdciitcdgknltiktestlkt tqfsctlgekfeettadgrktqtvcnftdgalvqhqewdgkestitrklkdgklvvecvm nnvtctriyekve