Dictionary of Human Evolution and Biology

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Rhodopsin

Light-sensitive pigment found in the membrane of the rod-shaped photoreceptor cells of the retina; composed of a derivative of vitamin A (11-cis-retinal) and opsin, the protein group. When rhodopsin absorbs a photon of light, its shape changes and it releases an electrical signal. Aka visual purple.

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From "Dictionary of Nursing and Individual Health Care"