Circadian Photoreception in Humans and Mice
Mol. Interv. 2002 2: 484-492.
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Circadian rhythms allow organisms to optimize particular behaviors with regard to the time of day. The molecular mechanisms that account for the nightlife of mice, and the working day of humans, rest on light-dependent oscillations in the expression of specific proteins. Chief among these are the cryptochromes, proteins that absorb blue light and appear to act as photoreceptors in the circadian rhythms of humans and mice, as well as in plants, where cryptochromes were first discovered. Research into the brains clockwork has recently received new impetus, based on an appreciation that the circadian rhythm is germane not only to disturbances of mood and sleep cycles, but also to pharmacological interventions into disease states such as cancer.