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Effect of morphine, WIN, or GP1a alone, or in combination with morphine, in the rat carrageenan test. (a) Morphine plus WIN: percentage of maximal analgesia. Effect of the combination was not significant by one‐way ANOVA compared to morphine alone. (b) Morphine plus GP1a. *P < .05; significantly different as indicated; one‐way ANOVA with Sidak's multiple comparison test. D, DMSO; S, saline
