Chains and heterogens:
PDB Chain Sequences:
>1iwkA (A:) mttetiqsnanlaplpphvpehlvfdfdmynpsnlsagvqeawavlqesnvpdlvwtrcn gghwiatrgqlireayedyrhfssecpfipreageaydfiptsmdppeqrqfkalanqvv gmpvvdklenriqelacslieslrpqgqcnftedyaepfpirifmllaglpeediphlky ltdqmtrpdgsmtfaeakealydylipiieqrrqkpgtdaisivangqvngrpitsdeak rmcglllvggldtvvnflsfsmeflakspehrqelierperipaaceellrrfslvadgr iltsdyefhgvqlkkgdqillpqmlsglderenacpmhvdfsrqkvshttfghgshlclg qhlarreiivtlkewltripdfsiapgaqiqhksgivsgvqalplvwdpattkav
>1iwkA (A:) nlaplpphvpehlvfdfdmynpsnlsagvqeawavlqesnvpdlvwtrcngghwiatrgq lireayedyrhfssecpfipreageaydfiptsmdppeqrqfkalanqvvgmpvvdklen riqelacslieslrpqgqcnftedyaepfpirifmllaglpeediphlkyltdqmtrpdg smtfaeakealydylipiieqrrqkpgtdaisivangqvngrpitsdeakrmcglllvgg ldtvvnflsfsmeflakspehrqelierperipaaceellrrfslvadgriltsdyefhg vqlkkgdqillpqmlsglderenacpmhvdfsrqkvshttfghgshlclgqhlarreiiv tlkewltripdfsiapgaqiqhksgivsgvqalplvwdpattkav