Chains and heterogens:
PDB Chain Sequences:
>1n68A (A:) aerptlpipdllttdarnriqltigagqstfggktattwgyngnllgpavklqrgkavtv diynqlteettlhwhglevpgevdggpqgiippggkrsvtlnvdqpaatcwfhphqhgkt grqvamglaglvvieddeilklmlpkqwgiddvpvivqdkkfsadgqidyqldvmtaavg wfgdtlltngaiypqhaaprgwlrlrllngcnarslnfatsdnrplyviasdggllpepv kvselpvlmgerfevlvevndnkpfdlvtlpvsqmgmaiapfdkphpvmriqpiaisasg alpdtlsslpalpslegltvrklqlsmdpmldmmgmqmlmekygdqamagmdhsqmmghm ghgnmnhmnhggkfdfhhankingqafdmnkpmfaaakgqyerwvisgvgdmmlhpfhih gtqfrilsengkppaahragwkdtvkvegnvsevlvkfnhdapkehaymahchllehedt gmmlgftv
>1n68A (A:) erptlpipdllttdarnriqltigagqstfggktattwgyngnllgpavklqrgkavtvd iynqlteettlhwhglevpgevdggpqgiippggkrsvtlnvdqpaatcwfhphqhgktg rqvamglaglvvieddeilklmlpkqwgiddvpvivqdkkfsadgqidyqldvmtaavgw fgdtlltngaiypqhaaprgwlrlrllngcnarslnfatsdnrplyviasdggllpepvk vselpvlmgerfevlvevndnkpfdlvtlpvsqmgmaiapfdkphpvmriqpiaisasga lpdtlsslpalpslegltvrklqlsmdpmldmmgmqmlmekygdqamagmdfhhanking qafdmnkpmfaaakgqyerwvisgvgdmmlhpfhihgtqfrilsengkppaahragwkdt vkvegnvsevlvkfnhdapkehaymahchllehedtgmmlgftv