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Hydrogen peroxide production is required by S. parasanguinis strain FW213 to inhibit P. aeruginosa in the presence of 1 mM nitrite. (A) Competition assay between PAO1 and S. parasanguinis FW213 (wild-type, ΔpoxL mutant, and poxL-complemented strains). (B) Competition assay between FRD1 and S. parasanguinis FW213 (wild-type, ΔpoxL mutant, and poxL-complemented strains).
