A) Type of growth of <i>E. coli fepD</i> and <i>fepG</i> mutants streaked in M9A and incubated overnight in aerobic conditions. B) Levels of reactive oxygen species in <i>E. coli</i> wild-type and <i>fepD</i>, <i>fepG, entS</i> and <i>entE</i> mutants grown in M9 medium. Quantitation of ROS levels was done using the DCFA-DA probe. Fluorescence intensities are relative to that of the control. Control: wt grown in M9 medium. Error bars = SD, n = 3.

<p>A) Type of growth of <i>E. coli fepD</i> and <i>fepG</i> mutants streaked in M9A and incubated overnight in aerobic conditions. B) Levels of reactive oxygen species in <i>E. coli</i> wild-type and <i>fepD</i>, <i>fepG, entS</i> and <i>entE</i> mutants grown in M9 medium. Quantitation of ROS levels was done using the DCFA-DA probe. Fluorescence intensities are relative to that of the control. Control: wt grown in M9 medium. Error bars = SD, n = 3.