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Phil Gutis with his dog, Abe, who died last year. Gutis, who has Alzheimer's, hoped an experimental drug could help preserve his memories. Courtesy of Timothy Weaver hide caption

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Courtesy of Timothy Weaver

After A Big Failure, Scientists And Patients Hunt For A New Type Of Alzheimer's Drug

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This light micrograph of a part of a brain affected by Alzheimer's disease shows an accumulation of darkened plaques, which have molecules called amyloid-beta at their core. Once dismissed as all bad, amyloid-beta might actually be a useful part of the immune system, some scientists now suspect — until the brain starts making too much. Martin M. Rotker/Science Source hide caption

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Martin M. Rotker/Science Source

Scientists Explore Ties Between Alzheimer's And Brain's Ancient Immune System

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Finding some change in the blood of an Alzheimer's patient that accurately reflects the damaging changes in the brain has been tough. utah778//iStockphoto/Getty Images hide caption

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utah778//iStockphoto/Getty Images