Figure 2.

Effects of hydroquinone on relaxant responses to electrical field stimulation (EFS, 1–5 Hz) in rat anococcygeus muscles in which tone was raised by guanethidine plus clonidine. Symbols represent means and I-bars are s.e.means (n=3–6). ^*Values in curves marked thus are significantly less than in control curve (ANOVA; P<0.05).