title: Tolerance to morphine-induced mydriasis in the rat pupil.
mesh_terms: D000818:Animals; D004361:Drug Tolerance; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D011680:Pupil / Q000187:drug effects*; D051381:Rats; D013997:Time Factors
chemical_list: D009020:Morphine