Figure 3. VF significantly inhibited the contractility of colonic smooth muscle strips from normal SD rats. Distal colonic strips of normal rats were treated with vehicle (PBS solution) or VF (200 ng/mL). Circular muscle strip contractility was recorded. (A) Representative image. (B) Quantitative analysis of contractile force. (C) Quantitative analysis of contractile frequency. *P < 0.05, n = 6.