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Effects induced by tetrapeptides 2, 3, 7, 8, and U50,488H in the formalin test. Compounds were administered s.c. at the dose of 100 mmol/mouse. Data were analyzed using one-way ANOVA followed by Tukey’s multiple comparisons test. *p < 0.05, **p < 0.01, ***p < 0.001, and ****p < 0.0001 vs V (vehicle-treated animals); N = 8.
