Doubling times of strains used in the study. Doubling times were measured in MOPS minimal medium at 37°C in microtiter plates (see methods). Error bars represent 95% confidence intervals for the average of 14 independent measurements. ANOVA revealed a significance of p < 0.005. Pairwise t-tests were conducted for each strain compared to the MDS42 strain, none of the strains showed a significant difference.