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Changes in tail flick latency after repeated electroacupuncture (EA) (Mean ± SD, %, n = 6). EA was given once daily for eight consecutive days. Rats in the sham group were treated with needles left on the acupoints, but without electricity. The significance of differences was calculated by a t-test or a one-way ANOVA. The values with different letters (a–e) within the EA treatment differ (p < 0.05); * p < 0.05 compared with the sham group within the same day.
