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).
And on the other side of the ball, the heaviest defenses in each conference (Raiders and Lions) are also two of the poorest (13th and 12th, respectively). Meanwhile, the lightest defense in the NFC (Buccaneers) is very strong (2nd), while the lightest defense in the AFC (Colts) is ranked dead last.