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The slow, second phase of calcium ion-induced neurotransmitter release, via exocytosis, into the synaptic cleft. This depends on high affinity calcium sensors and decays slowly, typically with a decay constant of over 100ms. The underlying molecular mechanisms of this process are distinct from those of the earlier, fast phase of release. [GOC:dos, GOC:pad, GOC:parl, PMID:7809151, PMID:7954835]
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