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Melanopsin in the Circadian Timing System
The role of melanopsin in the body’s internal clock
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Abstract
Melanopsin, a proposed candidate for circadian photoreception, may not be essential for this process.
- Circadian rhythms in mammals are generated by the suprachiasmatic nucleus (SCN) in response to light signals.
- Conventional photoreceptors, such as rods and cones, are not required for circadian photoreception.
- Melanopsin-containing retinal ganglion cells (RGCs) are intrinsically photosensitive and contribute to the light signaling pathway to the SCN.
- New findings suggest that melanopsin, while important, is not necessary for circadian photoreception.
- The redundancy in photoreceptive systems may allow multiple pathways to contribute to photic entrainment.
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