*2.7. Statistical Analysis*

The statistical analysis was performed by using the software SPSS 11.0. Data are presented with descriptive analysis (mean ± SD for 3 independent experiments). The comparisons between total comet scores of the different groups were performed by the non-parametric Kruskal-Wallis test followed by Mann-Whitney U test when the first one showed the presence of differences. Probability *p* ≤ 0.05 was accepted as the level of significance.
