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This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute?

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Day and night existed long before the first primitive cells came into being.

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And that light/dark cycle left its mark on nearly every living thing.

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Microbes, plants, insects, mammals - we all experience circadian rhythms, due to molecular clocks in our cells.

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But that internal timer affects more than just bedtime.

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The body's cells may actually divide by the clock too - in fruit flies, at least.

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Researchers gave fruit flies a form of inflammatory bowel disease.

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In response, the flies' intestinal stem cells got busy repairing the gut,

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most of them dividing in sync around dawn.

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But when researchers blocked the action of two clock genes in the intestine, the flies couldn't patch up the damage.

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Instead of a coordinated repair, the cells stalled in various stages of division,

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indicating that the internal clock plays a role in healing, too.

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Those results appear in the journal Cell Reports.

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The researchers say the circadian clock might inform healing in us too, since it's such an ancient trait.

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If so, they say doctors might want to time surgeries or chemotherapy for when the body is primed to heal, helping patients clock a faster recovery.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Christopher Intagliata.

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