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A different form of a gene called CHD1L found in people with African ancestry has been linked to lower HIV levels in people infected with the virus, and the discovery could open the door to improved treatments      

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Surgically attaching old mice to young mice to exchange their blood has previously been shown to rejuvenate the older individuals' brains, livers and muscles. Now, it has been shown to also extend their lifespan, even after the animals have been detached

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