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The control of neurotransmitter release by modulation of presynaptic calcium influx was investigated at the granule cell to Purkinje cell synapse in rat cerebellar slices. Excitatory post-synaptic currents were measured using whole cell voltage clamp, and changes in presynaptic Ca influx were determined with the Ca-sensitive dye mag-fura-5. Single stimuli of the parallel fibers evoked rapid changes...