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Andrea Gourdine holds a photo of her mother, Gladys Brown, who died in 2012 after being diagnosed with Alzheimer’s. Brown donated her brain to the University of California-Davis, for research. (Anna Gorman/KHN)

Andrea Gourdine holds a photo of her mother, Gladys Brown, who died in 2012 after being diagnosed with Alzheimer’s. Brown donated her brain to the University of California-Davis, for research. (Anna Gorman/KHN)