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Induction of Microsomal Oxidase in F1 Hybrids of a High and a Low Oxidase Housefly Strain

Microsomal oxidase activity is increased up to sixfold in dieldrin-resistant houseflies exposed to sublethal doses of dieldrin. The net increase in enzyme activity is greater in a strain initially high in oxidase activity than in a strain low in this respect, and this tendency is carried into the F1 hybrids of the strains.