HPLC analysis of the 33P-postlabeled DB[a,l]P-DNA adducts formed in CHO-B11 cells treated for 1 hr with (A): 1.4 μM (+)-syn-DB[a,l]PDE or (B) 1.4 μM (−)-anti-DB[a,l]PDE; (C) the DNA adducts formed by the reaction of 40 μM DB[a,l]P with DNA from CHO-B11 cells in the presence of HRP/H2O2; and (D) the DNA adducts formed in MCF-7 cells treated for 24 hr with 2 μM DB[a,l]P.