Chains and heterogens:
PDB Chain Sequences:
>1crzA (A:) dsgvdsgrpigvvpfqwagpgaapediggivaadlrnsgkfnpldrarlpqqpgsaqevq paawsalgidavvvgqvtpnpdgsynvayqlvdtggapgtvlaqnsykvnkqwlryaght asdevfekltgikgafrtriayvvqtnggqfpyelrvsdydgynqfvvhrspqplmspaw spdgsklayvtfesgrsalviqtlangavrqvasfprhngapafspdgsklafalsktgs lnlyvmdlasgqirqvtdgrsnnteptwfpdsqnlaftsdqagrpqvykvninggapqri twegsqnqdadvssdgkfmvmvssnggqqhiakqdlatggvqvlsstfldetpslapngt mviysssqgmgsvlnlvstdgrfkarlpatdgqvkfpawspyl