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Nature 447, xiii (24 May 2007) | doi:10.1038/7143xiiia; Published online 23 May 2007

Making the paper: Jiandie Lin

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The protein that helps our bodies tell the time.

Jet lag is a bothersome reminder that the human body is set to a 24-hour, or circadian, clock. The master clock resides in the brain and regulates various behaviours, including sleeping and waking, taking its cues from the rhythm of daylight.

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