>2nt2A (A:) observed residues (from ATOM records) sptqifehvflgsewnasnledlqnrgvryilnvtreidnffpgvfeyhnirvydeeatd llaywndtykfiskakkhgskclvhskmgvsrsastviayamkeygwnldraydyvkerr tvtkpnpsfmrqleeyqgilla