Chains and heterogens:
PDB Chain Sequences:
>2ctcA (A:) arstntfnyatyhtldeiydfmdllvaehpqlvsklqigrsyegrpiyvlkfstggsnrp aiwidlgihsrewitqatgvwfakkftedygqdpsftaildsmdifleivtnpdgfafth sqnrlwrktrsvtssslcvgvdanrnwdagfgkagassspcsetyhgkyansevevksiv dfvkdhgnfkaflsihsysqlllypygyttqsipdktelnqvaksavealkslygtsyky gsiittiyqasggsidwsynqgikysftfelrdtgrygfllpasqiiptaqetwlgvlti mehtlnn