Twisted protein fibers that are found within the cells of the hippocampus and certain brain areas are called and an excess of them may be related to the development of alzheimer's disease.

Prions

Explanation:

Prions are misfolded proteins found in the brain, they cause other proteins to fold the same way. The cell can't degrade the proteins which leads to an accumulation of these misfolded proteins and the development of neurodegenerative diseases like Alzheimer and Parkinson

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