>1xn5A (A:) observed residues (from ATOM records)
mtrlpdikkevrfnapiekvweavstseglafwfmendlkaetghhfhlqspfgpspcqv
tdverpiklsftwdtdgwsvtfhlkeeengtiftivhsgwkqgdtkvekagaesavvher
mdrgwhdlvnerlrqive