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Ann McKee, director Boston University's center for research into the degenerative brain disease chronic traumatic encephalopathy, or CTE, addresses an audience on the school's campus Thursday, Nov. 9, 2017 about the study of NFL football player Aaron Hernandez's brain, projected on a screen behind, in Boston. McKee says Hernandez suffered severe damage to parts of the brain that play an important role in memory, impulse control and behavior. (AP Photo/Steven Senne) ** FILE **

Ann McKee, director Boston University's center for research into the degenerative brain disease chronic traumatic encephalopathy, or CTE, addresses an audience on the school's campus Thursday, Nov. 9, 2017 about the study of NFL football player Aaron Hernandez's brain, projected on a screen behind, in Boston. McKee says Hernandez suffered severe damage to parts of the brain that play an important role in memory, impulse control and behavior. (AP Photo/Steven Senne) ** FILE **

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