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In A Major Discovery, Scientists Found That Aging Chimpanzees, Our Closest Genetic Relatives, Naturally Develop Amyloid-Β Plaques & Tau Tangles, Key Biological Markers Of Alzheimer’s (AD) Found In Human Brains Affected By AD. This Is The First Evidence Of Such Natural Markers In Non-Human Animals & May Aid Early Diagnosis In Humans.

Chimpanzees Are First Animal Shown to Develop Telltale Markers of Alzheimer's Disease – Scientific American

https://www.scientificamerican.com/article/chimpanzees-are-first-animal-shown-to-develop-telltale-markers-of-alzheimers-disease1/

Brain analysis revealed protein plaques and tangles, but whether the animals develop dementia is unclear