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Change in expression levels of selected genes in enrofloxacin-resistant (Enro) and E. coli MG1655 wild-type (WT) cells cultured in mineral medium at pH 6 or with additional salt (2% NaCl) compared to that in the wild-type strain (pH 6.9, 0% additional NaCl). Expression levels were compared to those by the wild type in the absence or presence (exp) of 0.125 μg/ml enrofloxacin. Data are the means ± SDs for two biological replicates.
