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Experimentally obtained relationship betweenPves2 and Pves1among the synapses (n = 42). The dashed line is the regression line for these data (r = 0.09; p > 0.05).Pves2 was calculated using Equation 2, whereP2 is the release probability at stimulus position 2, npool is the average size of the preprimed pool, and P1 is the release probability at stimulus position 1.
