Biologists have created mutant mice that live longer and age more slowly than ordinary mice. Experiments show that female mice with the mutation lived longer, and were less susceptible to cancer. As females aged, those with the mutation gained less weight and maintained better overall motor skills.

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Biologists have created mutant mice that live longer and age more slowly than ordinary mice. Experiments show that female mice with the mutation lived longer, and were less susceptible to cancer. As females aged, those with the mutation gained less weight and maintained better overall motor skills.