Researchers find a substance called tau in the blood of living former NFL players . But we do n't know if what is lighting up is tau alone , or beta amyloid , or both . '' Its pattern is identical to that found in chronic traumatic encephalopathy patients . It can only be detected after death . More research is needed to confirm the findings .
Researchers find a substance called tau in the blood of living former NFL players . Its pattern is identical to that found in chronic traumatic encephalopathy patients . It can only be detected after death . More research is needed to confirm the findings .