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The number of paw flinching at 5-min blocks (A) and at the first and second phases (B) after intramuscular (IM) injection of formalin. The number of paw flinching was recorded immediately after IM injection of formalin. Data are the means ± SEM obtained from six rats. * p < 0.05 compared to 2nd, 3rd and 10th – 12th five-min blocks
