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Colorful 3D illustration of a virus. The central structure is spherical with blue and yellow surface proteins, surrounded by orange and yellow spike-like protrusions. The vibrant background evokes a synaptic environment with purple and pink hues, suggesting dynamic activity.

Synaptic vesicles are sphere-like structures that measure about 40 nanometers in diameter. The vesicles encapsulate neurotransmitters that carry signals across neuronal synapses.

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