背景：胆碱乙酰化转移酶是乙酰胆碱合成的关键酶，是胆碱能神经系统功能活动的重要标志。
BACKGROUND: the choline acetyltransferase (ChAT) is the key synthetic enzyme for acetylcholine, and is the important symbol of the functional activity of the cholinergic system.
背景：胆碱乙酰化转移酶是乙酰胆碱合成的关键酶，是胆碱能神经系统功能活动的重要标志。
BACKGROUND: the choline acetyltransferase (ChAT) is the key synthetic enzyme for acetylcholine, and is the important symbol of the functional activity of the cholinergic system.
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