AP Photo/Merck & Co.

This undated image provided by Merck & Co., shows a cross section of a normal brain (right) and one of a brain damaged by advanced Alzheimer's disease. Alzheimer's patients and their families, desperate for an effective treatment for the epidemic disease, there's hope from new studies starting up and insights from recent ones that didn't quite pan out. (AP Photo/Merck & Co.)
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( December 12, 2012 )

This undated image provided by Merck & Co., shows a cross section of a normal brain (right) and one of a brain damaged by advanced Alzheimer's disease. Alzheimer's patients and their families, desperate for an effective treatment for the epidemic disease, there's hope from new studies starting up and insights from recent ones that didn't quite pan out. (AP Photo/Merck & Co.)

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