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Deletion of the pezAT operon increases resistance to ampicillin. (A) Pneumococcal strain-resistances detected by MIC, determined by change of color from resazurin (blue) to resorufin (pink). (B) Color changes measured by light absorbance at 600 nm (resazurin) as a function of the time of incubation, at the different concentrations of ampicillin indicated. Controls: no cells and no antibiotic. t-test was used to evaluate the statistical differences (p-value < 0.05).
