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Mechanical and thermal withdrawal thresholds in each group of mice. Normal saline injection (Con group, n = 8), CIP (CFA-induced chronic inflammatory pain), 2 Hz EA (CFA-induced chronic inflammatory pain with 2 Hz EA), sham EA (CFA-induced chronic inflammatory pain with sham EA), and TRPV1−/− (CFA-induced chronic inflammatory pain in TRPV1−/− mice). ∗p < 0.05 versus Con. #p < 0.05 versus CIP group.
