http://identifiers.org/mgd/MGI:1857225 Nfkappab1- MGI:1857225 p50<-> p105<-> p50<KO> NF-kappaB1<-> Nfkb1- targeted mutation 1, David Baltimore Null/knockout NF-kappaB<tm1Bal> NFkappaB1<0> Nfkb1<tm1Bal> NF-kappaB1 KO