What causes Alzheimer's?  Study puts leading theory to 'ultimate test'

What causes Alzheimer’s? Study puts leading theory to ‘ultimate test’

A doctor points to PET scan results that are part of Alzheimer’s disease research. Much work in the field focuses on a substance called beta-amyloid. A new study could test whether that’s the right target. Evan Vucci/AP hide caption toggle caption Evan Vucci/AP A doctor points to PET scan results that are part of Alzheimer’s …

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