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Growth of wild-type strain AB3012, AB3012 mutants 5 and 6 with transposon insertions in ameC and mexE, respectively, and the ΔmexE mutant AB3016 in various doses of chloramphenicol. Optical density at 600 nm (OD600) of cultures was measured after 20 h of incubation at 25°C. Error bars are standard deviations (SD); n = 3.
