Figure 3. Protective effect of EGCG on ARPE19 cells after UVA radiation exposure. ARPE19 cells were pretreated with EGCG for 2 h before being exposed to UVA radiation. Cell viability was determined by MTT assay 24 h after UVA irradiation (20 J/cm²). The control group means the cells were not neither treated with EGCG nor exposed to UVA radiation. The results are expressed as percentage of control and are represented by mean±SEM (n=4). The asterisk indicates p<0.05 versus UVA-exposed cells without EGCG pretreatment.