Alzheimer's disease has two key hallmarks: accumulation of amyloid protein plaques outside brain cells and of neurofibrillary tangles of tau protein inside brain cells. The plaques appear first, and then the tangles, giving the impression that one causes the other. However, evidence of this is scant, and scientists believe finding out precisely how these events are linked, will lead to new treatments to slow the relentless progress of this devastating brain-wasting disease...
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