Model systems Transgenic mice construction login to view 10 more bullets function login to view 2 more bullets Knockout mice construction login to view 2 more bullets function login to view 1 more bullet Chimeric mice construction login to view 3 more bullets function login to view 4 more bullets Cre-lox system construction login to view 1 more bullet function login to view 3 more bullets RNAi construction login to view 4 more bullets function login to view 1 more bullet