## Sequence.chains — list of all chains in the sequence

> This is a standard Python list of all the chains in the model. You can index this list either in standard Python fashion, or by using the one-letter PDB chain ID, for example if `'s'` is a `Sequence` object, and the first chain has ID 'A', both `'s.chains[0]'` and `'s.chains['A']'` will index this chain.

> See Section 6.19 for more information about `Chain` objects.

Example: See selection.assess_dope() command.