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Effects of administration of NGF 2.5S into the lower lip on heat sensitivity of whisker pad skin. Values of histograms are represented as mean ± SEM. Effect of lower lip NGF 2.5S (A) or saline (B) administrations on heat sensitivities of whisker pad skin on day 4. Gray, whisker pad skin of preinjection. Black, Ipsilateral whisker pad skin. White, Contralateral whisker pad skin. **p < 0.01 (n = 5 in each group; one-way ANOVA followed by Bartlett's multiple-comparison test).
