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Effect of efflux inhibitors on the accumulation of ethidium bromide for M. tuberculosis H37Rv (A), H37Rv MmrKO (B), and H37Rv::pCVZ2 (C). Ethidium bromide and efflux inhibitors were used at 1/2 the MIC to not compromise cellular viability. CCCP, carbonyl cyanide m-chlorophenylhydrazone; CPZ, chlorpromazine; EPI, efflux pump inhibitor; VP, verapamil.
