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The nature of time has been discussed for millenia. We don't know exactly why or where time perception exists, but we do have some information on how it is perceived. The circadian rhythm is basically in place to help us sleep, wake and perform tasks in a 24 hour cycle of light. Robbed of light, and the melatonin it's absence produces, the rhythm shifts ...


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Humans and many other organisms have a circadian clock, a biological system that oscillates every 24 hours (but is also sensitive to external stimuli). There are many components to the human circadian clock that are not known. On the molecular level, gene regulation, post-transcriptional and post-translational modification are all implicated. There is also ...



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