Seattle Seahawks linebacker Lofa Tatupu is donating his brain for science. He is one of three active NFL players who have agreed to donate tissue from their brains and spinal cord after death.

Tatupu's brain tissue will go to the Boston University School of Medicine's Center for the Study of Traumatic Encephalopathy, where it will be used in research projects about the effect of concussions.

Researchers have discovered a neurodegenerative disease called Chronic Traumatic Encephalopathy in several athletes who have died recently, including professional football players and boxers.

Tatupu joins Matt Birk of the Baltmore Ravens and Sean Morey of the Arizona Cardinals to become the first to agree to take part in the program while still actively playing professional football. They will be interviewed by phone every year through their lives.