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It's in the genes, night owls.

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Vincent
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The brain controls the circadian clock that regulates sleeping, digestion and brain activity to suit the different demands of day and night--but new research shows that individual cells also appear to have 'clocks' that are affected by a series of genes.

A German-Swiss team led by Dr. Steven Brown of the University of Zurich took skin biopsies from 28 volunteers and grew the cells in a lab. The researchers compared the speed of the clocks inside the cells with behavioural patterns of the subjects, who were divided into early types ('larks') and night owls according to the tick of their individual clock. They found that skin cells could be used to measure the speed of a person's body clock.

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