GCN2-KO GCN2.KO4 targeted mutation 1.2, David Ron MGI:3582154 Eif2ak4<tm1Nso> Eif2ak4<tm1.2Dron> Eif2ak4<tm1Munn> Null/knockout GCN2.KO4<ex> GNC2<-> http://identifiers.org/mgd/MGI:3582154