Linked from
The 17 pages that link to Synaptic vesicle, each with the reason it gives.
NeurotransmitterRelated: Neurotransmitters are commonly stored in these vesicles before release.
GlutamateRelated: Glutamate is packaged in vesicles before activity-triggered release.
GABARelated: GABA is packaged into these vesicles before calcium-triggered release.
NeurotoxinRelated: Botulinum toxin prevents neurotransmitter release by disrupting vesicle fusion.
Bernard KatzBroader topic: Vesicles provide the physical packets proposed by quantal theory.