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In page Cell cycle hypothesis of Alzheimer's disease:

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Alzheimer's disease (AD) is a neurodegenerative condition characterized by two hallmarks: senile plaques and the neurofibrillary tangle. Senile plaques are extracellular aggregations of amyloid-b (Aβ) protein. Neurofibrillary tangles are collections of hyperphosphorylated tau protein associated with microtubules found within neurons. Senile plaques and neurofibrillary tangles are widespread throughout brain tissue and mirror other pathological changes associated with AD.[citation needed]