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Levels of each POB-DNA adduct in the (A) nasal olfactory mucosa; (B) nasal respiratory mucosa; (C) oral mucosa; and (D) pancreas of NNK treated rats. Adduct levels are shown in sequence at each time point, as follows: □, O2-POB-Cyt; ■, 7-POB-Gua; 
, O2-POB-dThd; 
, O6-POB-dGuo.
