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A Δccp mutant is not more sensitive to millimolar doses of H2O2 than is the wild-type strain. Wild-type (MG1655) and Δccp mutant (MK416) cells were grown to OD600 ∼0.3 and challenged with 2.5 mM H2O2. Percent survival was calculated based on cfus. In contrast to an earlier report (28), we did not observe any difference in the sensitivities of these strains.
