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The (a) H33342 and (b) EtBr efflux assay with diphenylmethane in E. coli Kam3-AcrB. Dye was added to the drug-resistant E. coli cells, which were energized with glucose in the presence of DPM. H33342 (3 µM), EtBr (3 µM), glucose (25 mM), PAβN (20 µg/mL), and DPM. Data are expressed as mean ± SD (n = 3).
