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Growth competition between E. coli MG1655(pC193) and E. coli MG1655(pV38-8) in the absence of antibiotic selective pressure (a), in the presence of 0.5 μg/ml cefotaxime (CTX) (b), and in the presence of 8 μg/ml cefotaxime (c). The data are representative of three independent experiments. The error bars represent standard deviations.
