This combination of photos provided by Boston University shows sections from a normal brain, top, and from the brain of former University of Texas football player Greg Ploetz, bottom, in stage IV of chronic traumatic encephalopathy. According to a report released on Tuesday, July 25, 2017 by the Journal of the American Medical Association, research on the brains of 202 former football players has confirmed what many feared in life _ evidence of chronic traumatic encephalopathy, or CTE, a devastating disease in nearly all the samples, from athletes in the NFL, college and even high school. (Dr. Ann McKee/BU via AP) ** FILE **
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