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Representative growth curves of variants of E. coli MG1655 at different concentrations of amoxicillin. WT-YFP (wild-type-yellow fluorescent protein), the amoxicillin-susceptible variant (MIC 4 µg/mL), with genes coding for a yellow fluorescent protein and chloramphenicol resistance. M256, the strain derived from E. coli WT MG1655 by growing it at stepwise increasing amoxicillin concentrations. M8, WT-YFP after five days of growth at 2 µg/mL (MIC 32 µg/mL).
