CEA - ORSAY / CNRI / SCIENCE PHOTO LIBRARY CEA - ORSAY / CNRI / SCIENCE PHOTO LIBRARY
Brain in Alzheimer's disease. Positron emission tomography (PET) scan showing activity in the brain of a person with Alzheimer's disease. Alzheimer's is caused by neuron and synapse (degeneration) and the formation of protein plaques in the brain. This abnormal loss leads to atrophy (wasting away) of the affected areas. Symptoms include memory loss, personality changes and confusion.
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