1. The oxidation of aromatic hydrocarbons to arene oxides and the reduction of these oxides to the parent hydrocarbons are both catalysed by enzymes in the microsomal fraction of rat liver. A suggested name for the enzyme concerned in the reduction of these epoxides is 'epoxide reductase'. 2. 'Epoxide reductase' is NADPH-dependent and is inhibited by oxygen. 3. Preliminary investigations suggest that the enzyme is specific for both 'K-region' and 'non-K-region' arene oxides.
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