Chains and heterogens:
PDB Chain Sequences:
>1xf4A (A:) elqmtqspaslsasvgetvtitcraseniysylawyqqkqgkspqllvynaktlaegvps rfsgsgsgtqfslkinslqpedfgsyycqhhygtpltfgagtklelkradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrnec
>1xf4A (A:) elqmtqspaslsasvgetvtitcraseniysylawyqqkqgkspqllvynaktlaegvps rfsgsgsgtqfslkinslqpedfgsyycqhhygtpltfgagtklelkradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrne
>1xf4B (B:) qvkllesgpelvkpgasvkmsckasgytftsyvmhwvkqkpgqglewigyinpyndgtky nekfkgkatltsdkssstaymelssltsedsavyycvrggyrpyyamdywgqgtsvtvss akttppsvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsd lytlsssvtvpsstwpsetvtcnvahpasstkvdkkivprdctshhhhhh
>1xf4B (B:) qvkllesgpelvkpgasvkmsckasgytftsyvmhwvkqkpgqglewigyinpyndgtky nekfkgkatltsdkssstaymelssltsedsavyycvrggyrpyyamdywgqgtsvtvss akttppsvyplapsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytlsss vtvpsstwpsetvtcnvahpasstkvdkkivpr
>1xf4H (H:) qvkllesgpelvkpgasvkmsckasgytftsyvmhwvkqkpgqglewigyinpyndgtky nekfkgkatltsdkssstaymelssltsedsavyycvrggyrpyyamdywgqgtsvtvss akttppsvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsd lytlsssvtvpsstwpsetvtcnvahpasstkvdkkivprdctshhhhhh
>1xf4H (H:) qvkllesgpelvkpgasvkmsckasgytftsyvmhwvkqkpgqglewigyinpyndgtky nekfkgkatltsdkssstaymelssltsedsavyycvrggyrpyyamdywgqgtsvtvss akttppsvyplapsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytlsss vtvpsstwpsetvtcnvahpasstkvdkkivpr
>1xf4L (L:) elqmtqspaslsasvgetvtitcraseniysylawyqqkqgkspqllvynaktlaegvps rfsgsgsgtqfslkinslqpedfgsyycqhhygtpltfgagtklelkradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrnec
>1xf4L (L:) elqmtqspaslsasvgetvtitcraseniysylawyqqkqgkspqllvynaktlaegvps rfsgsgsgtqfslkinslqpedfgsyycqhhygtpltfgagtklelkradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrne