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The two versions of the visual cycle, classical and intraretinal, a series of chemical reactions, mostly enzyme-catalysed, underlying chromophore regeneration in rods and cones, respectively. Intra- and extra-photoreceptor processes are shaded blue and red, respectively. Rods work with the retinal pigmented epithelium in the classical visual cycle, whereas cones work with Müller cells in the intraretinal visual cycle.
