Chains and heterogens:
PDB Chain Sequences:
>3iw0A (A:) mswnhqsveiavrrttvpspnlppgfdftdpaiyaerlpvaefaelrsaapiwwngqdpg kgggfhdggfwaitklndvkeisrhsdvfssyengviprfkndiaredievqrfvmlnmd aphhtrlrkiisrgftpravgrlhdelqeraqkiaaeaaaagsgdfveqvscelplqaia gllgvpqedrgklfhwsnemtgnedpeyahidpkassaeligyamkmaeekaknpaddiv tqliqadidgeklsddefgffvvmlavagnettrnsitqgmmafaehpdqwelykkvrpe taadeivrwatpvtafqrtalrdyelsgvqikkgqrvvmfyrsanfdeevfqdpftfnil rnpnphvgfggtgahyciganlarmtinlifnavadhmpdlkpisaperlrsgwlngikh wqvdytgrcpvah
>3iw0A (A:) pnlppgfdftdpaiyaerlpvaefaelrsaapiwwngqdpgkgggfhdggfwaitklndv keisrhsdvfssyengviprfkndiaredievqrfvmlnmdaphhtrlrkiisrgftpra vgrlhdelqeraqkiaaeaaaagsgdfveqvscelplqaiagllgvpqedrgklfhwsne mtgnedpeyahidpkassaeligyamkmaeekaknpaddivtqliqadidgeklsddefg ffvvmlavagnettrnsitqgmmafaehpdqwelykkvrpetaadeivrwatpvtafqrt alrdyelsgvqikkgqrvvmfyrsanfdeevfqdpftfnilrnpnphvgfggtgahycig anlarmtinlifnavadhmpdlkpisaperlrsgwlngikhwqvdyt