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Effects of hydroquinone (n=4) and pyrogallol (n=5) on relaxant responses to NO (0.4–2 μM) in anococcygeus muscles in which tone was raised by guanethidine plus clonidine. Control responses are in the absence of pyrogallol or hydroquinone. Symbols represent means and I-bars are s.e.means. Symbols below * are significantly less than corresponding control value.
