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Role of catalase genes, rpoS, and other genes in the ΔiprA mutant phenotype. S. Typhimurium strain χ3339 containing the indicated mutations was tested for oxidative stress survival, and each strain was compared to the corresponding strain containing the WT iprA allele. Data are shown as the mean plus standard deviation, and observed differences from cognate strains containing WT iprA were found to be significant (as indicated by an asterisk) at a P value of <0.05 using a t test.
