>2cn6A (A:) observed residues (from ATOM records)
tsqvrqnyhqdseaainrqinlelyasyvylsmsyyfdrddvalknfakyflhqsheere
haeklmklqnqrggriflqdiqkpdcddwesglnamecalhldknvnqsllelhklatdk
ndphlcdfiethylneqvkaikelgdhvtnlrkmgapesglaeylfdkhtlg