Chains and heterogens:
PDB Chain Sequences:
>1pttA (A:) memekefeqidksgswaaiyqdirheasdfpcrvaklpknknrnryrdvspfdhsriklh qedndyinaslikmeeaqrsyiltqgplpntcghfwemvweqksrgvvmlnrvmekgslk caqywpqkeekemifedtnlkltlisediktyytvrqlelenlttqetreilhfhyttwp dfgvpespasflnflfkvresgslspehgpvvvhssagigrsgtfcladtclllmdkrkd pssvdikkvllemrkfrmgliqtadqlrfsylaviegakfimgdssvqdqwkelshedle pppehipppprppkrilephn
>1pttA (A:) emekefeqidksgswaaiyqdirheasdfpcrvaklpknknrnryrdvspfdhsriklhq edndyinaslikmeeaqrsyiltqgplpntcghfwemvweqksrgvvmlnrvmekgslkc aqywpqkeekemifedtnlkltlisediktyytvrqlelenlttqetreilhfhyttwpd fgvpespasflnflfkvresgslspehgpvvvhssagigrsgtfcladtclllmdkrkdp ssvdikkvllemrkfrmgliqtadqlrfsylaviegakfimgdssvqdqwkelshed