... retinoid-binding pro-teins between photoreceptors and retinal pigment epi-thelium (RPE); it is essential for maintaining normalvision [3,4]. The key step in the retinoid visual cycle is the ... RPE65c in the inner retina,including Mu¨ller cells, but not in the RPE. Furthermore, double-immuno-staining of dissociated retinal cells using antibodies for RPE65c and gluta-mine synthetase (a ... GS staining (B3), and 4¢,6-diamidino-2-phenylindole (DAPI) staining (B4), respectively. (B5-8) High magni cation images of the boxed area in (B4) showing RPE65c staining (B5), GS staining (B6),...