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Time killing curve of ARSA after exposure to CRE and ampicillin either alone or in combination. CON = control (drug free); CRE (0.25) = CRE at 0.25 mg/ml; AMP (32) = ampicillin at 32 μg/ml; AMP (1) + CRE (0.125) = ampicillin at 1 μg/ml plus CRE at 0.125 mg/ml; the values plotted are the means of 4 observations, and the vertical bars indicate the standard errors of the means.
