Caption (1) A nerve impulse arrives. (2) This causes calcium ion channels to open, resulting in an influx of calcium ions in the terminal. (3) This causes synaptic vesicles to fuse with the ...

Synaptic vesicles—sphere-like structures that store and release neurotransmitters such as dopamine and serotonin, are found in the presynaptic terminals of neurons. They play a crucial role in ...

like vesicles at bona fide synaptic terminals. One reason for skepticism in evaluating factors that induce presynaptic differentiation in vitro is the evidence that non-specific factors ...