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Survival of WT (BW25113, CGSC 7636) and mutant strains under ciprofloxacin (200 ng/ml) treatment. We followed standard protocols. Strains were exposed to ciprofloxacin in the late exponential phase, and viable cell numbers were determined by counting colonies on agar plates (see references 14 and 18). None of the single-knockout mutants showed enhanced survival under ciprofloxacin stress (P > 0.05, Wilcoxon test). Error bars indicate 95% confidence intervals.
