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a) Calcium concentration over a time course of pulses, frequency of 50 Hz. Top: τca = 1 msec, middle: τca = 10 msec, bottom: τca = 50 msec. b) Model parameters as they depend upon presynaptic calcium concentration. Top: dependence of probability of release, Pr, upon calcium concentration. Bottom: rate of recovery from depression krecov, as it depends upon calcium concentration
