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Inactivation of the SR is associated with increased superoxide levels and paraquat killing. (A) Relative intracellular superoxide levels using the DHE/EtBr fluorescence ratio. (B) Paraquat (PQ) killing of exponential (EXP) or stationary-phase (STAT) cells, calculated as percent bacterial survival after 6-h challenge with 10 mM PQ, compared with similar conditions without PQ. Results are shown as mean ± SEM (n ≥ 6). **P < 0.01 vs. WT.
