Chains and heterogens:
PDB Chain Sequences:
>1qpkA (A:) dqagkspnavryhggdeiilqgfhwnvvreapndwynilrqqaatiaadgfsaiwmpvpw rdfsswsdgsksgggegyfwhdfnkngrygsdaqlrqaasalggagvkvlydvvpnhmnr gypdkeinlpagqgfwrndcadpgnypndcddgdrfiggdadlntghpqvygmfrdeftn lrsqygaggfrfgfvrgyapervnswmtdsadnsfcvgelwkgpseypnwdwrntaswqq iikdwsdrakcpvfdfalkermqngsiadwkhglngnpdprwrevavtfvdnhdtgyspg qnggqhhwalqdglirqayayiltspgtpvvywdhmydwgygdfirqliqvrraagvrad saisfhsgysglvatvsgsqqtlvvalnsdlgnpgqvasgsfseavnasngqvrvwrs