Light stress induced photoreceptor degeneration and increased GluR2 levels. A, B. DAPI staining showed that light stress dramatically led to photoreceptor loss by pLX7. The whole retina thus was differentiated into light-damage and survivor zones. Western blotting (C) and analysis (D) showed increased levels of GluR2, n = 9. E. Confocal imaging revealed expected GluR2 expression in the OPL and IPL of control retina (postnatal day 80); scale = 20 μm.