Gfi1b expression in early precursor and hematopoietic stem cells. (A-C) Bone marrow cells from wt or wt/KI (Gfi1b+/GFP) mice, respectively, were depleted for lineage-positive cells (Lin: CD3, CD4, CD8, Mac-1, B220, Ter119, Ly6G, Pan natural killer [NK] plus Sca1, IL7Rα for CMP-GMP-MEP analysis), and negative cells were restained for surface markers as indicated and analyzed by flow cytometry (A-C, left panels). HSCs (A), MEPs, CMPs, GMPs (B), or CLPs (C) were electronically gated as previously described (see “Material and methods”) and analyzed for GFP expression (right panels).