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The effects of intracerebroventricular (ICV) administration of vitamin B12 (A) and diclofenac (B) on muscle pain behavior induced by intramuscular (IM) injection of formalin. Vitamin B12 and diclofenac were ICV administered 5 and 10 min before IM injection of formalin, respectively. Data are the means ± SEM obtained from six rats. * p < 0.05 compared to normal saline treated group
