(B) Survival of Rag2-/-Ggta1-/- (n = 9) mice after infection with a cecal inoculum from Ggta1-/- mice, and from Rag2-/-Ggta1-/- (n = 9) mice after infection with a cecal inoculum from Rag2-/-Ggta1-/- mice; two experiments. This evidence concerns the gene RAG2 and infection.