Figure 6. Frequency of occurrence of unitary exocytic events in control and in the presence of cAMP-ATP.

The frequency of appearance of discrete steps in C_m was measured in linearly changing epochs of C_m records (see Fig. 4 and Methods). Note that the frequency of discrete exocytic steps in C_m was statistically similar in controls (treated with DPA only) and in cells dialysed with cAMP-ATP (0.2 mM cAMP, 1 mM ATP).