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Levels of POB-DNA adducts in liver DNA isolated from rats treated with (A) (R)-NNN and (B) (S)-NNN. Symbol designations are: ▨, O2-POB-dThd; □, 7-POB-Gua; ■, O2-POB-Cyt. Each value is the mean ± S.D. of single analyses of DNA samples from three rats per group.
