an enzyme that hydrolyzes the neurotransmitter : its action is blocked by nerve gases and certain drugs.
an enzyme in nerve cells that is responsible for the destruction of acetylcholine and thus for switching off excitation of the nerve

acetylcholinesterase a·ce·tyl·cho·lin·es·ter·ase (ə-sēt’l-kō’lə-něs’tə-rās’, -rāz’)
Any of various enzymes in the blood and in certain tissues that catalyze the hydrolysis of acetylcholine.


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