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A methanolic extract of plaice skin, from which lipids had been removed, was chromatographed on alumina, eluted with decreasing concentrations of ethanol. Only the 60% ethanol fraction exhibited smooth muscle activity, with bradykinin-like properties. The 20% ethanol fraction increased vascular permeability in rat skin, as measured by dye-leakage. This was not due to the degranulation of mast cells. Intradermal injection of either fraction into the plaice caused localized erythema.
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