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Effect of acute caffeine preadministration on analgesia (AA). Evaluation of mechanical hypersensitivity in the postincisional pain model in mice. Each group represents the mean of eight animals, and the vertical error bars indicate the SEM. $$$p<0.001 when compared with the naive group; ***p<0.001 when compared with the vehicle group; ###p<0.001 when compared with respective saline+treatment groups. EA, electroacupuncture; MA, manual acupuncture.
