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This is a synaptic structure. The top left is the normal release of neurotransmitters from synapses in response to calcium stimulation; in the middle, botulinum toxin and α-LTX affect neurotransmitter release by acting on synapses (created with BioRender.com, accessed on 20 December 2022). SNARE: soluble N-ethylmaleimide-sensitive factor attachment protein receptor.
