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Comet assay. Comet assay of HEK293T (A,B) or 16HBE (C,D) transfected cells, either untreated (control) or exposed to 1, 2, 4 μmol/L BPDE for 6, 12, 24 h, or 24 h treatment followed by 24 h repair. The tail moment of 200 comets was analyzed for each experiment, n = 3. *P < 0.05
