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Aging and the Endocrine System

Normal brain vs. brain affected by Alzheimer's disease
Combination of two brain diagrams in one for comparison. In the left normal brain, in the right brain of a person with Alzheimer's disease. Estrogen and testosterone demonstrate neuroprotective effects and have been theorized to play a role in reducing the effects of Alzheimer's disease.
Source
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"Alzheimer's disease brain comparison."
http://commons.wikimedia.org/wiki/File:Alzheimer's_disease_brain_comparison.jpg
Wikimedia
Public domain.