Figure 4.

Expression levels of the superoxide dismutase (SOD) 1, SOD 2 and catalase genes in SH-SY5Y cells. mRNA levels of (a) the SOD 1, (b) the SOD 2, and (c) the catalase genes following treatment with 1 and 10 ppm of GBR extract and subsequent treatment with 250 μM H₂O₂, in comparison to untreated and 250 μM H₂O₂-treated controls. Bars represent means of groups (n=3) and error bars represent SDs. Different letters on any 2 bars representing each gene indicate statistically significant difference (p < 0.05) between the groups.