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Effect of anandamide (AEA) pre-treatment on nitroglycerin-induced hyperalgesia at the formalin test. Pre-treatment with AEA, 30 min before nitroglycerin (NTG) administration, significantly decreases the total number of flinches/shakes during phase II. *p < 0.05 versus NTG4 h group. Data were expressed as mean ± SD
