Medical Definition of A–beta
: beta-amyloid <Brain images of healthy people reveal that A-beta plaques are common, even in people who don't have dementia.—Tina Hesman Saey, Science News, 16 Aug. 2008> <Most A-beta dissolves quickly in the fluid surrounding the neuron.—Jeffrey Cowley, Newsweek, 31 Jan. 2000>
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