. "To identify interleukin-10 (IL-10)-producing cells in vivo, we generated a knockin mouse where an internal ribosome entry site (IRES) green fluorescence protein (GFP) element was inserted immediately before the polyadenylation site of the IL-10 gene. GFP fluorescence in cells from these mice was found to correlate positively with IL-10 protein expression. With this model, we found that after multiple T cell receptor (TCR) stimulations, strong expression of IL-10 was produced specifically by intraepithelial lymphocytes (IEL) in the small intestine and colonic lamina propria lymphocytes (cLPL). We found that anti-CD3 treatment induces T regulatory cell 1 (Tr1)-like cells in small intestinal IEL (sIEL) and led to the accumulation of naturally occurring regulatory T (nTreg) cells in colonic LPL (cLPL). These findings highlight the intestine as a unique site for induction of IL-10-producing T cells, which play a critical role in the regulation of inflammation in the gut." . . "Immunity" . "Flavell R.A." . "Galan J.E." . "Kim S.T." . "Kamanaka M." . "Sutterwala F.S." . "Wan Y.Y." . "Lara-Tejero M." . "Harhaj E." . "2006"^^ . "941-952" . "Expression of interleukin-10 in intestinal lymphocytes detected by an interleukin-10 reporter knockin tiger mouse." . "25" . "doi:10.1016/j.immuni.2006.09.013" .