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Changes in heat sensitivity measured in whisker pad skin for 14 d. CFA or saline was injected into the ipsilateral lower lip. Data are expressed as percentage (mean ± SEM) for withdrawal latency for each animal, normalized to withdrawal latency (100%) on preinjection. *p < 0.05 compared with withdrawal latency of saline-injected animals (n = 6 in each group; two-way ANOVA with repeated measures, followed by Bonferroni's multiple-comparison tests).
