Chains and heterogens:
PDB Chain Sequences:
>1fn4A (A:) dikltqspsllsasvgdrvtlsckgsqninnylawyqqklgeapklliyntnslqtgips rfsgsgsgtdytltisslqpedvatyfcyqynngytfgagtklelkrtaptvsifppste qlatggasvvclmnnfyprdisvkwkidgterrdgvldsvtdqdskdstysmsstlsltk adyeshnlytcevvhktssspvvksfnrnec
>1fn4B (B:) qvqllesgpglvrpsetlsltctvsgfsltsfsvswvrhpsgkgpewmgrmwydgytayn salksrlsisrdtsknqvflkmnslqtddtgtyyctrdlyggyplgfwyfdfwgpgtmvt vssvfplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgalssgvhtfpavlqsglytl tssvtvpsstwssqavtcnvahpasstkvdkkivprdc
>1fn4C (C:) dikltqspsllsasvgdrvtlsckgsqninnylawyqqklgeapklliyntnslqtgips rfsgsgsgtdytltisslqpedvatyfcyqynngytfgagtklelkrtaptvsifppste qlatggasvvclmnnfyprdisvkwkidgterrdgvldsvtdqdskdstysmsstlsltk adyeshnlytcevvhktssspvvksfnrnec
>1fn4D (D:) qvqllesgpglvrpsetlsltctvsgfsltsfsvswvrhpsgkgpewmgrmwydgytayn salksrlsisrdtsknqvflkmnslqtddtgtyyctrdlyggyplgfwyfdfwgpgtmvt vssvfplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgalssgvhtfpavlqsglytl tssvtvpsstwssqavtcnvahpasstkvdkkivprdc