Although much has been learned about CTE in recent years, exactly what causes it has been something of a mystery. Joseph Maroon and Russell Blaylock think they’ve figured it out.

Dr. Maroon is vice chair of the department of neurosurgery at UPMC and the team neurosurgeon for the Steelers. Dr. Blaylock is a biology professor at Belhaven University in Jackson, Miss. They published their theory in the August issue of the journal Surgical Neurology International.

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