<http://schema.org/description>
"Researchers from the Center for Vital Longevity at the University of Texas at Dallas and UT Southwestern Medical Center have completed a large-scale neuroimaging study of healthy adults from age 30 to 90 that measured beta-amyloid protein&amp;amp;#151;a substance whose toxic buildup in the brain is a diagnostic marker for Alzheimer's disease."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-02-marker-alzheimer-disease-affect-mental.html>