Figure 1. The interface of RPE and photoreceptor cells in albino mouse retina. The boxed area represents the approximate region of outer retina shown in subsequent immunocytochemistry images. Abbreviations: choroid (Ch); retinal pigment epithelium (RPE); photoreceptor cell outer segments (OS); photoreceptor cell inner segments (IS); outer nuclear layer (ONL); outer plexiform layer (OPL); inner nuclear layer (INL).