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Average expression levels of (A) mexA and (B) oprD transcripts relative to the control strain Pseudomonas aeruginosa PAO1 in extensively drug-resistant P. aeruginosa isolates with and without acquired metallo-β-lactamases (MBLs). Mean values ± standard error of the mean are indicated. Significant differences are indicated by * (P < 0.005) or ** (P < 0.0001).
