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Mechanical pain thresholds in five groups of mice. Normal saline injection (Normal group, n=8), CFM (Acid saline-induced chronic FM pain), 2 Hz EA (Acid saline-induced chronic FM pain treated with 2 Hz EA), sham EA (Acid saline-induced FM pain treated with sham EA), and TRPV1-/- (Acid saline-induced FM pain in TRPV1-/- mice). *P<0.05 vs Normal group. #P<0.05 vs CFM group
