Fig. 3

M. thaueri (combined pellet and supernatant) normalized fluorescence intensity scales linearly with cell concentration when diluted with blank Medium B, and with a mature C. churrovis culture, indicating that C. churrovis does not interfere with the fluorescent signal from M. thaueri. Dotted lines represent the 95 % confidence interval of each regression. The p-values represent a test for significant differences in the values of the slopes and intercepts of the two regressions