Depletion of HSCs in the BM of RbΔ/ΔE2f8Δ/Δ mice. (A-B) The absolute numbers of phenotypic stem cells (Lin−c-kit+Sca-1+ [LKS+]), progenitors (Lin−c-kit+Sca-1− [LKS−]), and long-term stem cells (Flk2−Lin−c-kit+Sca-1+) in the BM (A) and spleens (B) were estimated by flow cytometric analysis. Values above each bar in panel B represent the fold increases compared with control mice. (C-F) Photographs (C-D) and numbers (E-F) of CFU-S colonies from mice with the indicated genotypes. (G-H) Numbers of CFU-GEMM, CFU-GM, and BFU-E in the spleens (G) and BM (H) of mice with the indicated genotypes.