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Levels of 7-mG and 3-mA in the urine samples of A/J mice. The mice were given a single dose of NNK at a dose of 100 mg/kg bodyweight via i.p. injection (n = 2–7). Comparison was made with the control group by Dunnett’s test when one-way ANOVA was statistically significant. *,p < 0.05; **,p < 0.01; ***,p < 0.001; ****,p < 0.0001.
