The single-gene mutations directly responsible for early-onset Alzheimer's disease do not seem to be involved in late-onset Alzheimer's, and researchers have not found a specific gene that causes the late-onset form of the disease.
The NFLâs worst defense in 2015 are expected to be the Atlanta Falcons, Jacksonville Jaguars, Tennessee Titans, Chicago Bears and Tampa Bay Buccaneers (not necessarily in that order).
Top Ten Worst NFL Football Teams. The Top Ten. 1 Browns The Cleveland Browns are a professional American football team based in Cleveland, Ohio. The Browns compete in the National Football League as a member team of the American Football Conference North division.