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The revelation that Owen Thomas was found to be the first active college football player with chronic traumatic encephalopathy adds a twist to the growing body of research of the degenerative disease.

But CTE, which can only be diagnosed post-mortem, has a long history in athletics.

Infographic by Liz Jacobs | Images courtesy of Boston University School of Medicine and Creative Commons | Data courtesy of CSTE, The New York Times, Sports Legacy Institute

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