Expression of IL-20Rβ/IL-22R (IL-24R heterodimer) in tonsil B cells by flow cytometry. Tonsil B cells were purified and stained immediately (day 0) or after 3 to 4 days in culture with IL-2 + IL-10 + CD40L. Isotype APC-IgG1k, isotype PE-IgG1k, and biotinylated goat IgG followed by streptavidin, SA-FITC were used as controls.