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Alzheimer's researchers make big discovery
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ecades ago, researchers found rare gene mutations that led to Alzheimer's disease in all who inherit them. Now, they've found gene mutations that actually serve to protect the brain from the debilitating disease by slowing the buildup of a normal substance, called beta amyloid, in the brain. Doctors say the discovery is "hugely important" for drugs being developed to fight Alzheimer's.

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