Boxers Diego, left, and Jesse Magdaleno stand for a photo outside the Cleveland Clinic's Lou Ruvo Center for Brain Health, Wednesday, Feb. 15, 2012, in Las Vegas. The super featherweight and super bantamweight fighters are participating in a study at the center which will help researchers understand why some fighters suffer brain damage from punches taken in the ring while others can get hit in the head for years and show no effects. Researchers hope to eventually enroll more than 600 fighters in what is expected to be a four-year study of their brains. (AP Photo/Julie Jacobson)

Boxers Diego, left, and Jesse Magdaleno stand for a photo outside the Cleveland Clinic's Lou Ruvo Center for Brain Health, Wednesday, Feb. 15, 2012, in Las Vegas. The super featherweight and super ... more
Boxers Diego, left, and Jesse Magdaleno stand for a photo outside the Cleveland Clinic's Lou Ruvo Center for Brain Health, Wednesday, Feb. 15, 2012, in Las Vegas. The super featherweight and super bantamweight fighters are participating in a study at the center which will help researchers understand why some fighters suffer brain damage from punches taken in the ring while others can get hit in the head for years and show no effects. Researchers hope to eventually enroll more than 600 fighters in what is expected to be a four-year study of their brains. (AP Photo/Julie Jacobson) less

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