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Aging and the Nervous System
Effects of Alzheimer's Disease
Comparison of a normal aged brain (left) and the brain of a person with Alzheimer's (right). Differential characteristics are pointed out in the hippocampus, cerebral cortex, and ventricles.
Source
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"Alzheimer's disease brain comparison."
http://en.wikipedia.org/wiki/File:Alzheimer's_disease_brain_comparison.jpg
Wikipedia
Public domain.