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mexA expression was assessed in log-phase cultures of P. aeruginosa strains K767 (AmgR+) and K3159 (AmgR-) following a 30-min exposure to the MIC of diamide (4 mM for both strains) using qRT-PCR. Expression was normalized to rpoD and is reported to that of the untreated strain K767 (fold change). Values are means ± SEMs from at least three independent determinations, each performed in triplicate. t-test: **, P < 0.01.
