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A, examples of IPSCs evoked with 80 pulses delivered at 20, 50 and 100 Hz. Data from the same cell. B, interbouton variability of ARRs. Data obtained from 19 presynaptic terminals. C, dependence of the ARR on stimulation frequency. For each cell, values of ARRs were normalised to the ARR elicited with a 100 Hz train. Same data set as in B.
