**2.6. Statistical analysis**

Results of the H2 O2 assay are expressed as means ± SEM of three independent experiments. The data were analyzed using Shapiro-Wilks test followed by one way ANOVA. Subsequently, Levene's test and Tuckey's post hoc tests were performed. The level of significance was P < 0.05. Graph Pad Prism software (version 7, USA) was used for the analysis.
