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Sensitivity to polymyxin B. Growth of NGR234 (A), NGRΔacpXL (B), and NGRΩbacA (C) was measured in liquid RMS (♦) and RMS supplemented with polymyxin B at different final concentrations (■, 0.1 μg/ml; ▴, 0.25 μg/ml; ×, 0.5 μg/ml; *, 1 μg/ml). The values shown are the averages for three replicate experiments.
