Figure 1. Terminal deoxynucleotidyl transferase-mediated uridine 5′-triphosphate-biotin nick end labeling (TUNEL) in the retina of the control and light-damaged rats. The images show 4’,6-diamidino-2-phenylindole dihydrochloride (DAPI) labeling (blue) of the nuclei in the retina. In these images the ganglion cell layer (GCL) appears weakly labeled. A: Terminal deoxynucleotidyl transferase-mediated uridine 5′-triphosphate-biotin nick end labeling (TUNEL) labeling (green) was absent in the control rat in all retinal layers. B: TUNEL-positive cells were spread throughout the outer nuclear layer 6 h after light damage. At this time point no other retinal layers were TUNEL positive. Abbreviations: ONL, outer nuclear layer; INL, inner nuclear layer; OPL, outer plexiform layer; IPL, inner plexiform layer; GCL, ganglion cell layer. Scale bar = 50 μm.