lethality throughout fetal growth and development, complete penetrance_Cdk2<tm1Kald>/Cdk2<tm1Kald>,Cdk4<tm1Kiyo>/Cdk4<tm1Kiyo>,Cdkn1b<tm1Ako>/Cdkn1b<tm1Ako>
lethality throughout fetal growth and development, complete penetrance_Cdk2<tm1Kald>/Cdk2<tm1Kald>,Cdk4<tm1Kiyo>/Cdk4<tm1Kiyo>,Cdkn1b<tm1Ako>/Cdkn1b<tm1Ako>