Characterization of thymopoiesis in E8I-Cre+; Hdac3fl/flHdac3-KO mice. Related to Fig. 1. (A) Representative flow cytometry gating of live CD11b− CD11c− thymocyte populations in male 10-wk-old Hdac3-KO (E8I-Cre+; Hdac3fl/fl) mice and Hdac3-WT (Cre−; Hdac3fl/fl) littermates based on CD4 and CD8α expression. (B) Flow-cytometric measurement of thymocyte developmental stages, gated as in A. DD, CD4lo CD8lo double-dull; CD4, CD4+ CD8− single-positive; CD8, CD4− CD8+ single-positive thymocytes. (C and D) Flow-cytometric analysis (C) and quantification (D) of indicated thymocyte developmental stages in Hdac3-KO mice and Hdac3-WT littermates. (From left to right) Distribution of DN subsets, CD69hi MHC Ilo DD cells undergoing negative selection, CD5hi TCRβ+ DP cells undergoing positive selection, CD5+ mature CD4 SP, and CD5+ mature CD8 SP thymocytes. Data are representative of two independent experiments with three to five mice per genotype each. Means ± SD are indicated (B and D). P values were calculated by two-tailed Student’s t test (B and D). *, P < 0.05.