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Reserpine-binding site of MdfA. The backbone of MdfA is shown in cartoon representation. Two important cavity helices, TM1 and TM7, are coloured in cyan, while the other helices are in white. The reserpine molecule is illustrated with yellow sticks. Amino acid residues near reserpine are shown with green sticks. The omit 2Fo-Fc density for reserpine is contoured in marine (1σ) and pink (0.4σ). Hydrogen bonds between reserpine and N331 are shown as dotted lines
