Chains and heterogens:
PDB Chain Sequences:
>1xbnA (A:) mkgtivgtwiktlrdlygndvvdeslksvgwepdrvitpledidddevrrifakvsektg knvneiwrevgrqniktfsewfpsyfagrrlvnflmmmdevhlqltkmikgatpprliak pvakdaiemeyvskrkmydyflgliegsskffkeeisveevergekdgfsrlkvrikfkn pvfeykknvwglvpr