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Nitrite does not increase hydrogen peroxide production by S. parasanguinis FW213 but induces the generation of peroxynitrite in FW213. (A) H2O2 was measured in exponential-phase total cultures grown in THB with or without 1 mM nitrite. (B) Peroxynitrite was measured in exponential-phase cultures grown in M9 medium supplemented with 1 mM sucrose, with or without 1 mM nitrite. NS, not significant. *, P < 0.05 (Student t test).
