RAG2 and infection: RAG-2 deficient hosts were reconstituted with OT-I WT TamCre CD45.1 or OT-I Mrtfa−/−Mrtfbfl/fl TamCre CD45.2 bone marrow, treated with tamoxifen to inactivate Mrtfb, and subsequently co-transferred with OT-I WT cells to new hosts for infection analysis (Fig. 3D, E).