Distances between release sites. A, Distribution of distances to nearest neighbor. The distribution was determined separately for each mossy fiber and then normalized and averaged. Inset, Cumulative frequency histogram of nearest neighbor distances for four mossy fibers. B, Average number of release sites encountered at varying distances from a starting release site. This was determined separately for each mossy fiber and then averaged together. Inset, Close-up of the same relationship over the first 1 μm away from the average release site.