Analysis of cell-intrinsic effects of Nr1h4 deficiency on T cell differentiation in the thymus. CD45.2+ BM precursor cells from CD4-CreNr1h2+/+, CD4-CreNr1h2fl/+, or CD4-CreNr1h2fl/fl animals were mixed at a 1:1 ratio with CD45.1+ calibrator cells from WT donors and transferred into lethally irradiated mice. Thymi of recipient mice were analyzed 8 wk after reconstitution. (A) Representative flow cytometry plots comparing CD4-CreNr1h2+/+ and CD4-CreNr1h2fl/fl T cell development. (B) Contribution of CD45.2+ cells with the indicated genotype to the DN, DP, CD4SP, and CD8SP populations. (C) Frequencies of Annexin V+ cells among CD45.2+ CD4SP and CD8SP thymocyte subsets. (D) Frequencies of Foxp3+ cells among CD45.2+CD4SP thymocytes. (E and F) Representative flow cytometry plot (E) and quantification (F) of T reg cell precursor subsets among CD45.2+ CD4SP cells. Data are presented as mean ± SEM (n = 4–7). ns, nonsignificant = P > 0.05; *, P < 0.05; **, P < 0.01; ****, P < 0.0001. Statistical significance was determined using one-way ANOVA followed by the Holm-Šídák correction. Data are representative of three independent experiments.