Natural variation in ATP and ROS levels. Natural variation in mean ATP content (A) and mean relative ROS levels in pharyngeal bulbs (B) among C. briggsae isolates. Isolates are arranged along the x-axis in order of increasing ND5 deletion level. Bars show one standard error. A second order quadratic provided the best fit to the relationship between relative superoxide level and ND5 deletion frequency (B), [adjusted R*** = 0.191, coefficient (SE) = 0.451 (0.093), p < 0.0001] even if the HK105 isolate was omitted from the analysis [adjusted R*** = 0.250, coefficient (SE) = 0.256 (0.064), p < 0.0001].
Estes et al. BMC Evolutionary Biology 2011 11:11 doi:10.1186/1471-2148-11-11