H&E-stained paraffin sections of retina from the eyes of Het and KO mice raised on a VAS or VAD diet; original magnification, ×10 (A), ×20 (B). Black arrows indicate deteriorated outer segments in KO− mice. GCL, ganglion cell layer; INL, inner nuclear layer; IPL, inner plexiform layer; ONL, outer nuclear layer; OPL, outer plexiform layer; PI/OS, photoreceptor inner/outer segments.