Transgenic mice express functional IL-22R1 on lymphocytes. (A) A schematic diagram of the IL-22R1 transgene driven by a mouse CD2 promoter. (B) Southern blot analysis of IL-22R1 transgene in founders on a C57BL/6 background. (C) Zebra plots of flow cytometric analysis for IL-22R1 expression on myeloid (CD11b+), T (CD3+), and B (CD19+) cells in peripheral blood leukocytes. (D) Western blot analysis of STAT3 phosphorylation (Tyr705) in the thymus, lymph nodes, and spleen from tg founders and nontransgenic littermates.