Fig 2.

Complementation of ΔfetA and ΔfetB mutants with plasmid pF3 increases tolerance to H₂O₂ stress. Survival rates of E. coli BW25113 (WT) and the ΔfetA and ΔfetB strains with a control plasmid (pCntl) (A) or the fetA and fetB overexpression plasmid (pF3) (B) after 30 min of H₂O₂ stress were determined as described in the legend of Fig. 1B. Data are means ± standard errors of the means (n = 5). P values indicate the statistical significance of a Student t test performed between the WT and the KO strains.