title: External chemical messengers. IV. Pineal gland.
mesh_terms: D000818:Animals; D001001:Anura; D002415:Cats; D005399:Fishes; D006168:Guinea Pigs; D006801:Humans; D008027:Light; D008032:Limbic System / Q000502:physiology; D009074:Melanocyte-Stimulating Hormones / Q000502:physiology; D008550:Melatonin / Q000502:physiology; D009832:Olfactory Nerve / Q000502:physiology; D010858:Pigmentation / Q000502:physiology; D010870:Pineal Gland / Q000502:physiology*; D010902:Pituitary Gland / Q000502:physiology*; D011817:Rabbits; D051381:Rats; D012160:Retina / Q000502:physiology; D009435:Synaptic Transmission
chemical_list: D009074:Melanocyte-Stimulating Hormones; D008550:Melatonin