OPSIN

Opsin

Opsins are a group of light-sensitive 35–55 kDa membrane-bound G protein-coupled receptors of the retinylidene protein family found in photoreceptor cells of the retina. Five classical groups of opsins are involved in vision, mediating the conversion of a photon of light into an electrochemical signal, the first step in the visual transduction cascade. Another opsin found in the mammalian retina, melanopsin, is involved in circadian rhythms and pupillary reflex but not in image-forming.

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opsin

Noun

  1. Any of a group of light-sensitive proteins in the retina


The above text is a snippet from Wiktionary: opsin
and as such is available under the Creative Commons Attribution/Share-Alike License.

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