American Heritage® Dictionary of the English Language, Fourth Edition
- n. A protein of the retina, especially the protein constituent of rhodopsin, that makes up one of the visual pigments.
- n. retinal protein formed by the action of light on rhodopsin
- Probably back-formation from rhodopsin. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The gene, called opsin, is present in vision among vertebrate animals, and is responsible for a different way of seeing than that of animals like flies.”
“I had a feeling that my Irish in-laws have a long wavelength opsin and special photoreceptors to allow them to see how hot their tea is.”
“We vertebrates have ciliary cells, c-opsin, and a phosphodiesterase pathway.”
“Invertebrates have rhabodomeric cells that use a special version of the photopigment called r-opsin, and activate cells by a particular pathway called a phospholipase-C cascade.”
“Our complex eyes clearly evolved from the simpler eyes in ancestral species, and the presence of the critical light-receptive pigment called “opsin” in all animals highlights this shared ancestry.”
“Genetic evidence for selective transport of opsin and arrestin by kinesin-II in mammalian photoreceptors.”
“Nevertheless in that period, after dissecting retinas from 300 frogs, he found that rhodopsin on stimulation with light yielded both the protein opsin and a compound he called "retinene" (now "retinaldehyde") that in turn yielded vitamin A (now called retinol).”
“When light strikes the human retina it is absorbed by a molecule [retinal] which alters an attached protein [opsin], which then initiates what biochemists call a “cascade”—a precisely integrated series of molecular reactions that in this case causes a nerve impulse to be transmitted to the brain.”
“Modern vertebrate cilliary opsin binds to the adaptor protein transducin.”
“In non-chordate inverebrates, opsin is linked via the adaptor protein to an enzyme called phospholipase C, and in chordates and vertebrates, it is linked to a phosphodiesterase enzyme.”
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