Chains and heterogens:
PDB Chain Sequences:
>1qnf_ (-) maapilfwhrrdlrlsdniglaaaraqsaqliglfcldpqilqsadmaparvaylqgclq elqqryqqagsrllllqgdpqhlipqlaqqlqaeavywnqdiepygrdrdgqvaaalkta giravqlwdqllhspdqilsgsgnpysvygpfwknwqaqpkptpvatptelvdlspeqlt aiaplllselptlkqlgfdwdggfpvepgetaaiarlqefcdraiadydpqrnfpaeagt sglspalkfgaigirqawqaasaahalsrsdearnsirvwqqelawrefyqhalyhfpsl adgpyrslwqqfpwenrealftawtqaqtgypivdaamrqltetgwmhnrcrmivasflt kdliidwrrgeqffmqhlvdgdlaannggwqwsassgmdpkplrifnpasqakkfdatat yikrwlpelrhvhpkdlisgeitpierrgypapivnhnlrqkqfkalynqlkaai