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ERCC1, xeroderma pigmentosum group A (XPA), and xeroderma pigmentosum group C (XPC) mRNA expression levels in mouse lung tissue pretreated with 50, 100, 250, and 500 nmol/l folic acid and exposed to 32 μmol/l BaP for 24 h. Data represent the mean±standard error values of three independent experiments. Compared with the positive control, *P<0.05 and **P<0.01. Compared with the negative control, #P<0.05 and ##P<0.01.
