http://identifiers.org/mgd/MGI:1857261 TNF-alphaRI<-> Null/knockout TNFRp55- TNFR- TNFR1- targeted mutation 1, Tak Mak p55<-> TNF-R1- Tnfrsf1<atm1Mak> Tnfrsf1a<tm1Mak> Tnfrsf1a- TNFR1/p55<-> Pfeffer Tnfrsf1a<-> MGI:1857261