Chains and heterogens:
PDB Chain Sequences:
>1dxkA (A:) tviknetgtisisqlnknvwvhtelgsfngeavpsnglvlntskglvlvdsswddkltke liemvekkfqkrvtdviithahadriggiktlkergikahstaltaelakkngyeeplgd lqtvtnlkfgnmkvetfypgkghtednivvwlpqynilvggslvkstsakdlgnvadayv newstsienvlkryrninavvpghgevgdkglllhtldllk