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How do neuritic plaques cause Alzheimer's disease?

Neuritic plaques are composed of an abnormal protein called beta-amyloid. This protein is present in high levels in people with Alzheimer’s disease and low levels in people who do not have Alzheimer’s disease. One of the things that make this protein abnormal is that it is very sticky, and the thing that it sticks to the most is itself. It actually accumulates in these plaques that exist in between brain cells and interrupts the way brain cells like to communicate with each other. This may eventually lead to the formation of neurofibrillary tangles.

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