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To view the full text, please login as a subscribed user or purchase a subscription. Click here to view the full text on ScienceDirect. FiguresFigure 1Uncertainty of drug actionAmbiguity in defining a painkiller. (A) The cholecystokinin receptor antagonist proglumide (solid line) is better than placebo (dotted line) in relieving pain, suggesting that it is a painkiller.
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