Figure 5. Effect of bilberry extract, and Dp3G, Cy3G, or Mv3G individually on DTT-induced cell death in murine photoreceptor cell line. A: Experimental protocol in vitro. Effect of (B) bilberry extract, (C) delphinidin-3-glucoside (Dp3G), (D) cyanidin-3-glucoside (Cy3G), and (E) malvidin-3-glucoside (Mv3G) on dithiothreitol (DTT)-induced cell death in murine photoreceptor cells. The number of cells exhibiting propidium iodide (PI) fluorescence was counted and expressed as a percentage of Hoechst 33342–positive cells. Data are the means ± standard error of the mean (SEM; n=5 to 6). ^##p<0.01 versus control; **p<0.01 versus the vehicle (Dunnett’s multiple comparison test or Student t test).