YopE blocks the effects of RacH on growth and endocytosis. (A) Growth in nutrient medium. Cultures were inoculated at a density of 0.5 × 106 cells/ml. The graph is representative of two independent experiments, each run in duplicate. * P < 0.05 of GFP-RacH relative to AX2, † P < 0.05 of GFP-RacH/myc-YopE relative to AX2; ANOVA. (B) Fluid-phase endocytosis of FITC-dextran. Cells were resuspended in fresh axenic medium at 5 × 106 cells/ml in the presence of 2 mg/ml FITC-dextran. Fluorescence from the internalized marker was measured at selected time points. Data are presented as relative fluorescence, AX2 being considered 100%. Four independent experiments are averaged. For clarity, error bars are depicted only in one direction. * P < 0.05 relative to AX2, ANOVA.