Definition of "orexin" [orexin]

• Either of two neuropeptide hormones found in vertebrates; the hypocretins (noun)

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• "Suvorexant, formerly code-named MK-4305, is known as an orexin receptor antagonist."
• "Giving mice a shot of a hormone called orexin, which promotes wakefulness, also caused amyloid-beta levels to increase."
• "Almorexant is a new kind of drug, one that temporarily reduces levels of the brain chemical orexin, which is thought to help keep people awake."