Lego_side_chain [id an atom] or [mol res atom]
Pick a side chain rotamer for a specified residue from the library of preferred side chain conformations. A residue is specified by identifying any atom in the residue. A dial becomes activated to change the rotamer. On the PS300, the screen A-D must be used. This command requires the coordinates for `N', `CA', `C' atoms for each residue. Use Yes to choose the rotamer you want, No to end without changing the coordinates.