Chains and heterogens:
PDB Chain Sequences:
>1bh3A (A:) mislngygrfglqyvedrgvgledtiissrlrinivgttetdqgvtfgaklrmqwddgda fagtagnaaqfwtsyngvtvsvgnvdtafdsvaltydsemgyeassfgdaqssffkynsk ydasgaldnyngiavtysisgvnlylsyvdpdqtvdsslvteefgiaadwsndmislaaa yttdaggivdndiafvgaaykfndagtvglnwydnglstagdqvtlygnyafgattvray vsdidragadtaygigadyqfaegvkvsgsvqsgfanetvadvgvrfdf