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A "biological clock" gene in mammals that governs their daily cycle of waking and sleeping has been identified by scientists, researchers revealed Thursday.

Scientists at Northwestern University said they found the clock gene on mouse Chromosome 5 in a region that closely corresponds to a region on Chromosome 4 in humans.

Researchers said the finding could eventually help shed light on sleep disorders, certain types of depression and even jet lag.

Neurobiologist Joseph Takahashi speculated that such research could lead to the development of "drugs that allow you to reset your internal clock."

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