Chains and heterogens:
PDB Chain Sequences:
>1bygA (A:) gwalnmkelkllqtigkgefgdvmlgdyrgnkvavkcikndataqaflaeasvmtqlrhs nlvqllgviveekgglyivteymakgslvdylrsrgrsvlggdcllkfsldvceameyle gnnfvhrdlaarnvlvsednvakvsdfgltkeasstqdtgklpvkwtapealrekkfstk sdvwsfgillweiysfgrvpypriplkdvvprvekgykmdapdgcppavyevmkncwhld aamrpsflqlreqlehikthel
>1bygA (A:) gwalnmkelkllqtigkgefgdvmlgdyrgnkvavkcikndaqaflaeasvmtqlrhsnl vqllgviveeglyivteymakgslvdylrsrgrsvlggdcllkfsldvceameylegnnf vhrdlaarnvlvsednvakvsdfgllpvkwtapealrekkfstksdvwsfgillweiysf grvpypriplkdvvprvekgykmdapdgcppavyevmkncwhldaamrpsflqlreqleh ikthel