Accordingly, day 25 after HCT, feces from the ileum of 1-DEX-treated Gut-aGVHD recipients and 4-DEX-treated SR-Gut-aGVHD recipients given WT-T cells, 4-DEX-treated non-SR-Gut-aGVHD recipients given IL-22−/− T cells, and non-GVHD recipients given TCD-BM alone were analyzed for 16 S ribosomal RNA sequences. Here, IL22 is linked to graft versus host disease.