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(central) Simplified schematic overview of the arrangement of retinal pigment epithelium cells, rod and cone photoreceptor cells, and Müller glial cells. (right) Biochemical key steps of the classical visual cycle. (left) Photic RGR-dependent visual cycle. N-ret-PE, N-retinylidene-phoshatidyl-ethanolamine, RAL, retinal, RE, retinyl ester, Rho, rhodopsin, ROL, retinol.
