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Any of various light-sensitive proteins, especially one that is a constituent of a rhodopsin or other visual pigment found in the retina of the vertebrate eye.
[Probably back-formation from rhodopsin.]
(Biochemistry) the protein that together with retinene makes up the purple visual pigment rhodopsin
[C20: back formation from rhodopsin]
any of several compounds that form the protein component of the light-sensitive pigment rhodopsin.
[1950–55; probably back formation from rhodopsin]
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|Noun||1.||opsin - retinal protein formed by the action of light on rhodopsin|
protein - any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"
iodopsin - a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision