Chains and heterogens:
PDB Chain Sequences:
>1n51A (A:) seisrqefqrrrqalveqmqpgsaalifaapevtrsadseypyrqnsdfwyftgfnepea vlvliksddthnhsvlfnrvrdltaeiwfgrrlgqdaapeklgvdralafseinqqlyql lngldvvyhaqgeyayadvivnsaleklrkgsrqnltapatmidwrpvvhemrlfkspee iavlrrageitamahtramekcrpgmfeyhlegeihhefnrhgarypsyntivgsgengc ilhytenecemrdgdlvlidagceykgyagditrtfpvngkftqaqreiydivleslets lrlyrpgtsilevtgevvrimvsglvklgilkgdvdeliaqnahrpffmhglshwlgldv hdvgvygqdrsrilepgmvltvepglyiapdaevpeqyrgigirieddivitetgnenlt asvvkkpeeiealmvaarkq