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Sensitive and resistant populations under antibiotic residue concentrations of 0.5 μg/ml antibiotic 1 plus 0.5 μg/ml antibiotic 2 (a), 1 μg/ml antibiotic 1 plus 1 μg/ml antibiotic 2 (b), and 2 μg/ml antibiotic 1 plus 2 μg/ml antibiotic 2 (c). Time is shown in arbitrary units (a.u).
