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Effect of nos deletion on sensitivity to oxidative stress. S. xylosus C2a, Δnos, and ΔnospRBnos strains were grown under aerobic conditions up to OD = 1 and treated for 1 h with 150 mM hydrogen peroxide (H2O2). Cells, before and after treatment, were enumerated. Data represent means ± SD from n = 2 independent biological replicates. *p < 0.05.
