Fig. 3From: Coarse needle surface potentiates analgesic effect elicited by acupuncture with twirling manipulation in rats with nociceptive painThe different shapes of the scratches on the differently scraped needle surfaces in the stereomicroscope images were obtained by using atomic force microscope (AFM). The normal (ACU, a), lightly scraped (ACU600, b), and deeply scraped (ACU200, c) acupuncture needlesBack to article page