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The "chain identifier" does exactly what it says: it identifies the polypeptide or other molecular chain. For some structures, there is only one, so you'll only see an identifier A. However, many structures show two or more proteins bound together, or an enzyme complexed to a substrate, or a small molecule inhibitor in a binding pocket - there are many ...


This is actually a very difficult problem, because a given compound may exist in multiple conformations (have multiple structures), and it might not be obvious what conformation is most relevant. For example, a seemingly simple compound like glucose has multiple stereoisomers: if you say "glucose", you probably mean alpha-D-glucose, as opposed to ...

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