Figure 1. Viability of ARPE19 cells following UVA radiation exposure. The cells were exposed to UVA radiation at indicated doses. They were then incubated in serum-free medium for 24 h. Cell viability was determined by MTT assay. The results are expressed as percentage of control and are represented by mean±standard error (SE) determined from three independent experiments. All p values are for comparisons between control and UVA-irradiated cells. The asterisk indicates p<0.05 versus control.