Figure 5: (a) Agarose gel (1.5%) electrophoresis of RT-PCR products showed the effects of 15 μg/mL ISL alone and associates with 200 μM NAC/BSO pretreatment on the mRNA expression of TYR, TRP-1, and TRP-2 against GADPH. (b) The quantified RT-PCR results in ISL treatments via relative gene expression ratios to GAPDH. Bars represent means ± SD of three independent experiments , versus ISL-treatment group.