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Effects of EA at 2 Hz and 100 Hz on GNTI- (0.3 mg/kg) induced scratching. EA was applied to the LI4 and LI11 acupoints before GNTI administration. The number of scratches was counted for 40 min after pruritogen injection. EA at 2 Hz, but not 100 Hz, attenuated GNTI-induced scratching behavior (*P < 0.05 compared to controls). Between-group comparisons for each group were performed by ANOVA, followed by Tukey's test.
