The protein moiety of the pigment in the rods of the retina.

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sco·top·sin skə-'täp-sən n a protein in the retinal rods that combines with retinal to form rhodopsin

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sco·top·sin (sko-topґsin) the opsin of the rods of the retina that combines with 11-cis retinal to form rhodopsin. See illustration at visual cycle, under cycle.

Medical dictionary. 2011.

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