RAG1 and colitis: While control Tregs inhibited colitis development, the suppressive potential of oligomycin‐pretreated Tregs was impaired, as the Rag1−/− recipients of CD45Rbhi T cells and oligomycin‐pretreated Tregs showed more severe colitis compared to Rag1−/− recipients of CD45Rbhi T cells and control Tregs (Figure 5H,I).