Figure 3

A, typical DNA migration patterns of BEAS-2B cells treated with 500 μM H₂O₂ for 1 h at 37°C. B, tail moment (TM) representing the DNA breaks induced by H₂O₂ in BEAS-2B cells. Cells were exposed to H₂O₂ at 37°C for 1 h and then subjected to alkaline single-cell gel electrophoresis (Comet assay). Values are expressed as the means ± SD of 3 experiments carried out in duplicate (n = 3). *, **, significantly different from controls at p < 0.05 and p < 0.01, respectively (Mann-Whitney U test).