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Acetylcholine (Ach) transmission through synapse (cholinergic transmission) and action of acetylcholinesterase (AChE) on acetylcholine. ACh: acetylcholine; AChE: acetylcholinesterase; PAS: peripheral anionic site; CAS:catalytic active site; TRY: tryptophan; SER: serine; HIS: histidine; GLU: glutamate.
