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Restricts user-specified positions, which are aligned with positions in a source-pdb, to the identities observed in the source pdb. Can be used to revert pre-specified residues to their identities in a wild-type progenitor. Can also be used to modify a task factory to only consider the identities in the source pdb for the target positions (while not changing the packer task for other positions). Note that the pose and the source pose must be aligned for this to work. Residues that have no aligned residue on the target pdb are ignored.