Protection from autoimmunity is not due to the expansion of Treg subsets. Protection from autoimmunity is not due to the expansion of Treg subsets. (A.

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Protection from autoimmunity is not due to the expansion of Treg subsets. Protection from autoimmunity is not due to the expansion of Treg subsets. (A to D) Flow plots showing similar representation of CD4+ T cells at islets in the two scenarios (A and B) but different amounts of CD8+ T cells (C and D). (E) Despite having lower amounts of total CD8+ T cells, LO mice had more islet-specific P14 T cells in the pancreas. (F and G) The distributions of Ag specificity of the CD8+ T cells present in the pancreas are visualized in (F) and (G), where each dot represents 1of 100. (H and I) Representative fixed, frozen tissue sections from HI and LO pancreata displaying the TCR-tg cells [red, P14 (islet-specific); green, OT-I (non–islet-specific)] and endogenous CD8+ T cells [blue, anti-CD8 monoclonal antibody (mAb) (polyclonal)] in islets (dashed lines). Scale bar, 20 μm. (J to L) CD4+/CD25+/FoxP3+ Treg fractions were not different between the two scenarios. (M and N) The abundant population of non–islet-specific T cells in the HI scenario had not transformed into a CD8+ Treg type as judged by the expression of FoxP3 (M) and CD122 (N). Groups are representative of at least three independent experiments. Data are means ± SEM. *P < 0.05, two-tailed unpaired Mann-Whitney U tests. MFI, mean fluorescence intensity. Gustaf Christoffersson et al. Sci. Immunol. 2018;3:eaam6533 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works