title: Biological motivation.
mesh_terms: D000374:Aggression / Q000187:drug effects / Q000502:physiology; D000818:Animals; D002766:Cholecystokinin / Q000502:physiology; D002940:Circadian Rhythm; D005260:Female; D005824:Genetics, Behavioral; D012739:Gonadal Steroid Hormones / Q000502:physiology; D006801:Humans; D007323:Instinct; D008297:Male; D051379:Mice; D009042:Motivation / Q000502:physiology*; D018377:Neurotransmitter Agents / Q000502:physiology; D010455:Peptides / Q000502:physiology; D012527:Satiation / Q000187:drug effects
chemical_list: D012739:Gonadal Steroid Hormones; D018377:Neurotransmitter Agents; D010455:Peptides; D002766:Cholecystokinin