Distribution of vesicles relative to active zone and glial facing membrane.

<p><b>A)</b> Histogram of the percentage of vesicles relative to distance from active zone (in nm), in unstimulated (black, upper panel), 0.033 Hz stimulated (orange, second panel) and 1 Hz stimulated (blue, third panel) slices. Dashed line shows separation of bimodal population at 50 nm. Cumulative frequency plot of vesicles for the three conditions are provided in the lower panel. <b>B)</b> Distribution of vesicles relative to glial facing membrane. Labels as for (A).