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Rhodopsin is a biological pigment in photoreceptor cells of the retina that is responsible for the first events in the perception of light. Rhodopsins belong to the G-protein-coupled receptor family and are extremely sensitive to light, enabling vision in low-light conditions. Rhodopsin consists of the protein moiety opsin and a reversibly covalently bound cofactor, retinal.Rhodopsin of the rods most strongly absorbs green-blue light and, therefore, appears reddish-purple, which is why it is also called "visual purple". It is responsible for monochromatic vision in the dark.

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Rhoifolin is a chemical compound. It is a flavone, a type of flavonoid.

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Ribitol is a crystalline pentose alcohol formed by the reduction of ribose. It occurs naturally in the plant Adonis vernalis, as well as in the cell walls of Gram positive bacteria.It contributes to the chemical structure of riboflavin and Flavin mononucleotide.

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