RAG1 and infection: From day 4 post-infection through day 6, Rag2−/−Il2rg−/− lost significantly more weight than either Rag1−/−Il7ra−/− or Rag1−/− mice; there was never a difference between weight loss in Rag1−/−Il7ra−/− and Rag1−/− mice (Fig. 5e).