tau protein noun1 •A protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases.[Bennet] Omalu’s experimental breakthrough – along with UCLA researchers – uses positron-emission tomography (PET scan) and a radioactive “tracer” called FDDNP to bind to tau proteins in the brain. — 2017 formstau proteins