What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Mar 17 2015 07:57:27 AM PDT

Find out more about chronic traumatic encephalopathy, the disease several former NFL pros claim they are now suffering from due to hits on the field.

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Mark Wilson/Getty Images

The NFL Players Association initially refused to pay Mackey a disability income due to there not being a proven link between brain injury and playing football. The league and the NFL Players Association have responded with the "88 plan" –- named after Mackey's number.


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