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(a) The interaction plot of time and group in the writhing test, *P < 0.05, **P < 0.01, versus the vehicle group in the same time intervals. n = 8–12. (b) Total number of writhing episodes in 30 min after acetic acid injection, *P < 0.05, **P < 0.01 versus the vehicle group. n = 8–12.
