>1n18A (A:) observed residues (from ATOM records)
atkavavlkgdgpvqgiinfeqkesngpvkvwgsikglteglhgfhvhefgdntagctsa
gphfnplsrkhggpkdeerhvgdlgnvtadkdgvadvsiedsvislsgdhsiigrtlvvh
ekaddlgkggneestktgnagsrlacgvigiaq