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Relative expression levels of efflux pumps, porins, and regulators. The different colors indicate the different MICs for the strains (blue, MIC = 8 mg/liter; purple, MIC = 16 mg/liter; red, MIC = 32 mg/liter; yellow, MIC = 64 mg/liter; green, MIC = 128 mg/liter; gray, MIC = 256 mg/liter). *, P < 0.05; **, P < 0.01; ***, P < 0.001.
