Ink4a/ARF<F2-3> targeted mutation 4, Ronald DePinho No functional change|Conditional ready Cdkn2a<tm4Rdp> MGI:2687203 Ink4a/Arf Lox Ink4a/Arf<lox> Ink4a-p19ARF<-> http://identifiers.org/mgd/MGI:2687203