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A, B, The effects of intra-CeA microinjections of vehicle (ACSF) or (S)-3,4-DCPG (0.1 nmol) on the spontaneous firing of RVM ON (A) or OFF (B) cells in rats receiving saline (Nor) or carrageenan (Carr) into the hindpaw. Microinjections of vehicle or drug solution (200 nl) were performed at time 0. Each point represents the mean ± SEM of 7 neurons. Significant differences vs Carr/ACSF at *p < 0.05 or **p <0.01, respectively (two-way ANOVA/Newman–Keuls).
