... GS staining (B3), and 4¢,6-diamidino-2-phenylindole (DAPI) staining (B4), respectively. (B5-8) High magnificationimages of the boxed area in (B4) showing RPE65c staining (B5), GS staining (B6), ... atRE, all-trans retinyl ester; atROL, all-trans retinol; CRALBP, cellularretinaldehyde-binding protein; GFP, green fluorescence protein; GS, glutamine synthetase; LRAT, lecithin retinol acyltransferase; ... enzymes and 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...