| http://www.w3.org/ns/prov#value | - One of the brain scans is a PET scan that uses a radioactive marker to detect abnormal concentrations of tau, a protein that damages brain cells in areas that control memory, emotions and other functions.Prior to the UCLA work, tau deposits indicative of CTE were diagnosed posthumously, as was the case in more than 50 deceased NFL players, including Webster and former All-Pro linebacker Junior Sea
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