GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Alzheimer's disease, computer artwork. Alzheimer's is a neurodegenerative disease and a common cause of dementia in the elderly. It is caused by the formation of protein plaques in the brain, which kill surrounding neurons. Neurons (purple) surrounded by plaques (red) are shown in the circle at upper right. The cause of Alzheimer's is not known and there is no cure.
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