Chains and heterogens:
PDB Chain Sequences:
>1xxfA (A:) ivggtasvrgewpwqvtlhttsptqrhlcggsiignqwiltaahcfygvespkilrvysg ilnqaeikedtsffgvqeiiihdqykmaesgydiallklettvnyadsqrpiclpskgdr nviytdcwvtgwgyrklrdkiqntlqkakiplvtneecqkryrghkithkmicagyregg kdackgdsggplsckhnevwhlvgitswgegcaqrerpgvytnvveyvdwilektqav
>1xxfA (A:) ivggtasvrgewpwqvtlhttsptqrhlcggsiignqwiltaahcfygvespkilrvysg ilnqaeikedtsffgvqeiiihdqykmaesgydiallklettvnyadsqrpiclpskgdr nviytdcwvtgwgyrklrdkiqntlqkakiplvtneecqkryrghkithkmicagyregg kdackgdsggplsckhnevwhlvgitswgegcaqrerpgvytnvveyvdwilektqa
>1xxfB (B:) ivggtasvrgewpwqvtlhttsptqrhlcggsiignqwiltaahcfygvespkilrvysg ilnqaeikedtsffgvqeiiihdqykmaesgydiallklettvnyadsqrpiclpskgdr nviytdcwvtgwgyrklrdkiqntlqkakiplvtneecqkryrghkithkmicagyregg kdackgdsggplsckhnevwhlvgitswgegcaqrerpgvytnvveyvdwilektqav
>1xxfB (B:) ivggtasvrgewpwqvtlhttsptqrhlcggsiignqwiltaahcfygvespkilrvysg ilnqaeikedtsffgvqeiiihdqykmaesgydiallklettvnyadsqrpiclpskgdr nviytdcwvtgwgyrklrdkiqntlqkakiplvtneecqkryrghkithkmicagyregg kdackgdsggplsckhnevwhlvgitswgegcaqrerpgvytnvveyvdwilektqa
>1xxfC (C:) aesvqplekiapypqaekgmkrqviqltpqedestlkvelligqtlevdcnlhrlggkle nktlegwgydyyvfdkvsspdftrvvcpdgkkekkfvtaylgdagmlrynsklpivvytp dnvdvkyrvwkaeekidnavvr
>1xxfC (C:) qplekiapypqaekgmkrqviqltpqedestlkvelligqtlevdcnlhrlggklenktl egwgydyyvfdkvsspdftrvvcpdgkkekkfvtaylgdagmlrynsklpivvytpdnvd vkyrvwkaeekidnavvr
>1xxfD (D:) aesvqplekiapypqaekgmkrqviqltpqedestlkvelligqtlevdcnlhrlggkle nktlegwgydyyvfdkvsspdftrvvcpdgkkekkfvtaylgdagmlrynsklpivvytp dnvdvkyrvwkaeekidnavvr
>1xxfD (D:) qplekiapypqaekgmkrqviqltpqedestlkvelligqtlevdcnlhrlggklenktl egwgydyyvfdkvsspdftrvvcpdgkkekkfvtaylgdagmlrynsklpivvytpdnvd vkyrvwkaeekidnavvr