dr. ann mckee believes some people may be at higher risk of getting the disease than others.ining n.f.l. star aaron hernandez's brain, she identified a genetic bio-marker she believes may have predisposed him to c.t.e., a discovery that could have far- reaching implications on the football field and battlefield. do you think you will ever be your old self again? >> tom bates: i don't ever see me being my old self again. i think it's just too far gone. >> alfonsi: so what's your hope then? >> tom bates: just to not become worse than i am now. >> alfonsi: since our story first aired, over 100 veterans have contacted dr. gandy to enroll in ongoing trials to identify whether they are living with c.t.e., and more than 300 have reached out to dr. mckee about donating their brains to research. ( ticking ) having moderate to severe plaque psoriasis is not always easy. it's a long-distance journey, and you have the determination to keep going. humira has a proven track record of being prescribed for over 10 years. humira works inside the body to target and help block a specific source

dr. ann mckee has spent 14 years looking at the brains of hundreds of athletes who suffered concussions.arlie