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SNAP-25B is a neuronal protein required for neurotransmitter (NT) release and is the target of Botulinum Toxins A and E. It has two SNARE domains that form a four-helix bundle when combined with syntaxin 1A and synaptobrevin. Formation of the three-protein complex requires both SNARE domains of SNAP-25B to align parallel, stretching out a central linker. The N-terminal of the linker has four cysteines...