Scientists' picture of how a gene strongly linked to Alzheimer's disease harms the brain may have to be revised, researchers at Washington University School of Medicine in St. Louis have found. People with harmful forms of the APOE gene have up to 12 times the risk of developing Alzheimer's disease compared with those who have other variations of the gene. Many researchers believe that the memory loss and cognitive problems of Alzheimer's result from the buildup over many years of brain amyloid plaques. The plaques are made mostly of a sticky substance called amyloid beta...
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