Deletion of fliC increased the resistance of the ΔarcA mutant E. coli to H
. Growth and survival of wild type E. coli (diamond), ΔarcA mutant E. coli (square), ΔfliC mutant E. coli (triangle) and ΔarcA/ΔfliC double mutant E. coli (cross) in LB medium containing 1.5 mM H2O2 (a) or LB broth alone (b). The survival of bacteria was determined by plating and plotted against the indicated incubation time period. At least three experiments were performed, and results from a representative experiment performed in triplicates are shown. Error bars indicate standard deviation and sometimes fall within the data label.