LEA PATERSON / SCIENCE PHOTO LIBRARY LEA PATERSON / SCIENCE PHOTO LIBRARY
Alzheimer's disease, conceptual image. Elderly women behind letters spelling out the word 'Alzheimer'. Alzheimer's disease 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. The cause of these plaques is not known and there is no cure.
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