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Arsenic trioxide-induced DNA damage as characterized by the increase in tail moment, the percentage of DNA damage, and the length of comet tails in colon cancer (HT-29) cells. Cells were exposed to arsenic trioxide for 24 h, and the comet assay was performed as described in the Materials and Methods section. Data were expressed as means ± SDs. Differences were considered statistically significant at P < 0.05 according to the Dunnett’s test.
