Chains and heterogens:
PDB Chain Sequences:
>1bvtA (A:) tviknetgtisisqlnknvwvhtelgsfngeavpsnglvlntskglvlvdsswddkltke liemvekkfqkrvtdviithahadriggiktlkergikahstaltaelakkngyeeplgd lqtvtnlkfgnmkvetfypgkghtednivvwlpqynilvggclvkstsakdlgnvadayv newstsienvlkryrninavvpghgevgdkglllhtldllk