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mexCD‐oprJ is an envelope stress‐inducible multidrug efflux operon of Pseudomonas aeruginosa. A gene encoding a homologue of the NfxB repressor of this operon, PA4596, occurs downstream of oprJ and was proposed as a second repressor of this efflux operon. Inactivation of this gene had no impact on mexCD‐oprJ expression in cells not exposed to envelope stress although its loss under envelope stress...