title: An electric-shock method of inducing pain responsive to morphine in man.
mesh_terms: D000328:Adult; D000698:Analgesia; D000700:Analgesics / Q000592:standards*; D004597:Electroshock; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D008722:Methods; D008875:Middle Aged; D009020:Morphine; D010146:Pain; D010919:Placebos
chemical_list: D000700:Analgesics; D010919:Placebos; D009020:Morphine