title: Pharmacologic studies on analgesics. VII. Significance of the calcium ion in morphine analgesia.
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D002614:Chelating Agents / Q000494:pharmacology; D004336:Drug Antagonism; D004492:Edetic Acid / Q000494:pharmacology; D004558:Electric Stimulation; D008614:Meperidine / Q000494:pharmacology; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D009269:Nalorphine / Q000494:pharmacology; D010424:Pentobarbital / Q000494:pharmacology
chemical_list: D000700:Analgesics; D002614:Chelating Agents; D009020:Morphine; D008614:Meperidine; D004492:Edetic Acid; D010424:Pentobarbital; D002118:Calcium; D009269:Nalorphine