Cholinergic link in yawning.
D000818:Animals; D002799:Cholinergic Fibers / Q000502:physiology*; D005260:Female; D000882:Haplorhini; D006801:Humans; D008297:Male; D009055:Mouth; D009270:Naloxone / Q000494:pharmacology; D010215:Papio; D010830:Physostigmine / Q000494:pharmacology; D012018:Reflex / Q000187:drug effects / Q000502:physiology*; D013375:Substance Withdrawal Syndrome / Q000503:physiopathology
D009270:Naloxone; D010830:Physostigmine