Chains and heterogens:
PDB Chain Sequences:
>1i57A (A:) mdykddddklefmemekefeqidksgswaaiyqdirheasdfpcrvaklpknknrnryrd vspfdhsriklhqedndyinaslikmeeaqrsyiltqgplpntcghfwemvweqksrgvv mlnrvmekgslkcaqywpqkeekemifedtnlkltlisediksyytvrqlelenlttqet reilhfhyttwpdfgvpespasflnflfkvresgslspehgpvvvhssagigrsgtfcla dtclllmdkrkdpssvdikkvllemrkfrmgliqtadqlrfsylaviegakfimgdssvq dqwkelshed
>1i57A (A:) emekefeqidksgswaaiyqdirheasdfpcrvaklpknknrnryrdvspfdhsriklhq edndyinaslikmeeaqrsyiltqgplpntcghfwemvweqksrgvvmlnrvmekgslkc aqywpqkeekemifedtnlkltlisediksyytvrqlelenlttqetreilhfhyttwpd fgvpespasflnflfkvresgslspehgpvvvhssagigrsgtfcladtclllmdkrkdp ssvdikkvllemrkfrmgliqtadqlrfsylaviegakfimgds