title: Effect of constant lighting on the morphine susceptibility rhythm.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003624:Darkness; D005260:Female; D008027:Light; D051379:Mice; D008815:Mice, Inbred Strains; D009020:Morphine / Q000494:pharmacology*
chemical_list: D009020:Morphine