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Wikipedia definition
1. OrexinOrexin, also called hypocretin, is a neurotransmitter that regulates arousal, wakefulness, and appetite. The most common form of narcolepsy, in which the sufferer briefly loses muscle tone, is caused by a lack of orexin in the brain due to destruction of the cells that produce it. The brain contains very few cells that produce orexin: in a human brain, about 10,000 to 20,000 neurons in the hypothalamus.
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