Fig. 6. The distribution of digestive vacuoles (A) in untreated microstomes (control) and (B) in cells treated with 5 µmol l^-1 nocodazole. No significant differences were observed between the control and treated cells. In all experiments, the concentration of T. thermophila was 10⁵ cells ml^-1. The experiment was repeated three times, and 100 microstomal cells were counted in each experiment. Values are expressed as the mean + S.E.M.