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. 2008 Jan;1(1):3–6. doi: 10.4103/0974-2077.41148

Figure 1.

Figure 1

Synaptosomal acetylcholine vesicle fusion requires a complex interaction of VAMP and membrane bound SNAP25/syntaxin. BTXA is entering the nerve ending by endocytosis. The light chain of the molecule specifically cleaves SNAP-25. The target for some other BTX serotypes is different (see text). By this way, acetylcholine release from nerve endings is blocked.