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FILE – In this Aug. 14, 2018 file photo, a doctor looks at a PET brain scan at the Banner Alzheimers Institute in Phoenix. Two experimental drugs failed to prevent or slow mental decline in a study of people who are virtually destined to develop Alzheimer’s disease at a relatively young age because of rare gene flaws. The results announced Monday, Feb. 10, 2020, are another disappointment for the approach that scientists have focused on for many years — trying to remove a harmful protein that builds up in the brains of people with the disease. (AP Photo/Matt York, File)

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