A highly toxic beta-amyloid--a protein that exists in the brains of Alzheimer's disease victims has been found to greatly increase the toxicity of other more common and less toxic beta amyloids. This has now been found to be a possible trigger for the development of Alzheimer's. It is called pyroglu, and it is seen as a "bad guy" for Alzheimer's disease. This protein can spread and infect all of the other proteins around it, and in that process destroying the brain. (In the case of Alzheimer's, causing extreme dementia before death.) The presence of this protein is an early indicator of this detrimental disease.
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