Chains and heterogens:
PDB Chain Sequences:
>1b2rA (A:) dvpvnlyrpnapfigkvisneplvkeggigivqhikfdltggnlkyiegqsigiippgvd kngkpeklrlysiastrhgddvddktislcvrqleykhpesgetvygvcstylthiepgs evkitgpvgkemllpddpeanvimlatgtgiapmrtylwrmfkdaeraanpeyqfkgfsw lvfgvpttpnilykeeleeiqqkypdnfrltyaisreqknpqggrmyiqdrvaehadqlw qliknqkthtyicglrgmeegidaalsaaaakegvtwsdyqkdlkkagrwhvaty