Figure 10. Percent tail DNA in the alkaline comet assay (strand breaks in white) and oxidized purines (grid) in a modified comet assay with FPG in V79 cells under 24 h exposure with El Cerrejon and Gucamaya coal. a) Statistically significant differences in relation negative control (NC) without enzyme P <0.05. b) Statistically significant differences in relation to the same sample group with an enzyme. The results are shown as the mean ± SEM.
