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).
In todayâs installment of the âNFL 101â series, former NFL defensive back Matt Bowen breaks down the basics of the 3-4 defensive front to give you a better understanding of the pro game. Click here for a breakdown of the 4-3 defensive front. The 3-4 defense consists of three defensive linemen (two defensive ends, one nose tackle) and four linebackers (two outside linebackers, two inside linebackers).