A protein that forms part of the visual pigment rhodopsin and is released by the action of light.
- Rhodopsin consists of a protein called opsin bonded to a pigment called retinal.
- Vitamin A then combines with a protein opsin to form rhodopsin.
- Visual pigments are composed of a light-absorbing chromophore that is bound to the protein opsin.
1950s: shortening of rhodopsin.
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