TnfRI- Tnfrsf1a<tm1Blt> Null/knockout R1KO TNFRp55 p55TNFR- http://identifiers.org/mgd/MGI:1861040 p55- Tnfr1<0> Rothe Tnfrsf1a<-> MGI:1861040 targeted mutation 1, Horst Bluethmann