Fig. 1 Phase Shift of Circadian Rhythms by Melanopsin (IMAGE)
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Melanopsin, a blue photoreceptor in retinal cells, receives blue light each morning and transmits the signal via the nerves of the eye to the SCN, the circadian rhythm central pacemaker. The photo stimulation resets the phase of the circadian rhythms every morning and synchronizes one's own rhythm to the earth's light-dark cycle.
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