Variations in the activity of a DNA repair enzyme 0(6)-alkylgianine-DNA alkyltransferase (AGT) were studied in gastric mucosa samples obtained from 15 M. fascicularis monkeys chronically exposed to a gastrocarcinogen N-ethyl-N'-nitro-N-nitrosoguanidine. Marked interindividual difference in the enzyme activity before and in the course of the exposure was observed. The value of AGT activity assay to predict individual susceptibility to alkylating carcinogens is discussed.
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