title: Increase in brain and spinal acetylcholine levels without antinociceptive actions following morphine administration in the frog.
mesh_terms: D000109:Acetylcholine / Q000032:analysis*; D000818:Animals; D001001:Anura; D001921:Brain / Q000187:drug effects; D001923:Brain Chemistry / Q000187:drug effects*; D004558:Electric Stimulation; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D011893:Rana esculenta; D013116:Spinal Cord / Q000032:analysis* / Q000187:drug effects
chemical_list: D009020:Morphine; D000109:Acetylcholine