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countable and uncountable, plural acetylcholines
(biochemistry) A neurotransmitter in humans and other animals. It is an ester of acetic acid and choline with chemical formula CH3COOCH2CH2N+(CH3)3. quotations examples
Acetylcholine build-up in the body can be toxic.
2020, Avni Doshi, Burnt Sugar, Hamish Hamilton, page 11