>1xxfA (A:) observed residues (from ATOM records)
ivggtasvrgewpwqvtlhttsptqrhlcggsiignqwiltaahcfygvespkilrvysg
ilnqaeikedtsffgvqeiiihdqykmaesgydiallklettvnyadsqrpiclpskgdr
nviytdcwvtgwgyrklrdkiqntlqkakiplvtneecqkryrghkithkmicagyregg
kdackgdsggplsckhnevwhlvgitswgegcaqrerpgvytnvveyvdwilektqa