Fig. 8From: Coarse needle surface potentiates analgesic effect elicited by acupuncture with twirling manipulation in rats with nociceptive painPain behavior after formalin injection roughness-dependently in early and late phase. NOR: non-treated normal group, ACU: plain needle group, Formalin + ACU600: lightly scraped needle group, Formalin + ACU200: deeply scraped needle group, Formalin + MOR10: morphine group. *p < 0.05, ***p < 0.001 versus NOR group; #p < 0.05 versus ACU groupBack to article page