title: Opioid peptides, brain and behaviour: a brief review.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001923:Brain Chemistry; D004723:Endorphins / Q000502:physiology*; D004745:Enkephalins / Q000502:physiology*; D006801:Humans; D051381:Rats; D011957:Receptors, Opioid
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid