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How multiple research groups and the NFL battled over Junior Seau's brain to lead the science of concussions.

Two nationally prominent concussion researchers -- including a senior adviser to the NFL -- served as paid consultants to law firms suing the league for allegedly concealing the link between football and brain damage.

Brain scans performed on five former NFL players revealed images of the protein that causes football-related brain damage -- the first time researchers have identified signs of the crippling disease in living players.

Junior Seau suffered from the type of chronic brain damage that also has been found in dozens of deceased former players, three independent scientists concluded.

An ESPN "Outside the Lines" investigation, reported by Mark Fainaru-Wada and Steve Fainaru, provides new information on the hot-button concussion issue. It reveals how the NFL tracks, manages and describes head injuries. Jets RB Shonn Greene is me...

Three years after Congress pressured the NFL to overhaul its concussion program, the league effort remains marked by inconsistencies in how it tracks, treats and even describes serious head injuries.

Boston University researchers now have 50 confirmed cases of former football players with CTE -- 33 who played in the NFL, one in the CFL, one semi-professionally, nine through college and six who played only in high school.

The logic seems inevitable: If an NFL disability board decided 12 years ago after a contested hearing that concussions cause serious damage, the NFL should be legally required to admit now and forever that concussions cause serious damage.

The NFL's disability board concluded playing football caused brain injuries, even as officials issued denials for years .

The forensic pathologist who first identified chronic brain damage as a factor in the deaths of some NFL players flew to San Diego on Thursday to participate in the autopsy of Junior Seau, two sources with knowledge of the case told ESPN.com.