Gene Block, a professor of psychiatry and biobehavioral sciences at University of California, Los Angeles, and colleagues found that by middle age, the signal the master body clock in the brain sends out to other internal clocks to help resynchronize the different processes gets weaker.

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They also believe that techniques used to block this gene in mice could be used on humans, including those who have difficulty developing muscles.

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Rosanne and two other scientists decided to block the gene for apolipoprotein B, the main component in the form of cholesterol that contributes to heart attacks.

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