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Sensitivity of S. meliloti WT, hfq, katC, and rpoE2 strains to H2O2. All the strains were grown in GAS medium. Cells were collected in exponential (open symbols) or stationary (closed symbols) phases of growth and challenged with 100 mM H2O2. The data are represented as percent survival relative to the level for unstressed cells (t = 0 min). The results are the means from five independent experiments.
