Rhodopsin
Light-sensitive receptor protein / From Wikipedia, the free encyclopedia
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Rhodopsin, also known as visual purple, is a protein encoded by the RHO gene[5] and a G-protein-coupled receptor (GPCR). It is the opsin of the rod cells in the retina and a light-sensitive receptor protein that triggers visual phototransduction in rods. Rhodopsin mediates dim light vision and thus is extremely sensitive to light.[6] When rhodopsin is exposed to light, it immediately photobleaches. In humans, it is regenerated fully in about 30 minutes, after which the rods are more sensitive.[7] Defects in the rhodopsin gene cause eye diseases such as retinitis pigmentosa and congenital stationary night blindness.
This article is about the visual rhodopsin of the vertebrate rods. For other types of rhodopsin, see Retinylidene protein.
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