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melanopsin

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melanopsin
An opsin-like protein, sensitive to light with a peak sensitivity around 480 nm, and found in the very small proportion of retinal ganglion cells which are photosensitive. It is believed to be the visual pigment that synchronizes the circadian cycle to the day-night cycle as well as being involved in the control of pupil size and the release of melatonin. This neural circuit appears to be independent of the conventional retinal phototransduction in the rods and cones. See pupil light reflex.


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Focusing their efforts on the melanopsin light sensor, which is responsible for sensing day and night but barely involved - in mammals, at least - in seeing images, Yau's team looked for melanopsin-containing cells in other vertebrates, and found some in the retinal horizontal cells in goldfish and catfish.
More specifically, melanopsin is found in a subtype of intrinsically photoreceptive retinal ganglion cells (ipRGCs) (Berson et al.
2006) reported the discovery of a melanopsin in retinal ganglion cells of chickens that functions in the circadian rhythm and pupillary light reflex.
 
 
 
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