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Electron density maps (2Fo − Fc) of QacR(E57Q) in complex with (a) malachite green (MG) and (b) dequalinium (Dq). The molecules are shown as sticks with carbon, nitrogen, and oxygen atoms colored yellow, blue, and red, respectively. The maps were calculated after refinement of the protein structure and prior to addition of the drugs. The contour level is 0.8σ.
