title: The role of the pituitary in the diurnal variation in tolerance to painful stimuli and brain enkephalin levels.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D002940:Circadian Rhythm; D004723:Endorphins / Q000378:metabolism*; D004744:Enkephalin, Methionine; D004745:Enkephalins / Q000378:metabolism*; D006801:Humans; D007016:Hypophysectomy; D008297:Male; D051379:Mice; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology*; D010902:Pituitary Gland / Q000502:physiology*; D011388:Prolactin / Q000097:blood; D051381:Rats; D013315:Stress, Psychological / Q000503:physiopathology
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D004744:Enkephalin, Methionine; D011388:Prolactin