FIG 5 .

SrrA and NreC partially compensate for the growth defect in the nos mutant. (A) AUCs of the nos single mutant and 16 TCS nos double mutants were calculated following growth in the presence of 0.5 mM nitrite, and data are plotted relative to the AUC of the wild-type strain (means ± SEM, n = 3). (B and C) Growth of srrA nos (B) and nreC nos (C) double mutants relative to a nos single mutant (means ± SEM, n = 3). (D and E) Effect of nitrite supplementation (0.5 mM) on nreC nos (D) and srrA nos (E) double mutants relative to the wild-type strain (means ± SEM, n = 3).