Abstract
Elevation of cytosolic Ca2+ level in the postsynaptic cell is critical for the induction of many forms of activity‐dependent synaptic modulation. Based on our recent evidence that in muscle cells and fibroblasts constitutive exocytosis is increased by elevating cytosolic Ca2+ levels, we hypothesize that Ca2+ ‐dependent exocytosis at the postsynaptic site may provide a mechanism for a localized, activitt‐dependent synaptic modulation. 1994 John Wiley & Sons, Inc.