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Hydrogen peroxide killing of M. smegmatis mc2155, mc21608, and mc21609 grown in liquid MM alone and liquid MM plus 50 μM FeCl3 (MM+Fe). Exponential-growth-phase cultures were exposed to the indicated concentrations of H2O2, and the surviving fraction of the population was determined by counting CFU. 100% survival corresponds to ≈108 CFU per ml.
