Csf2rb expression is related to Cbfb-MYH11–induced differentiation defects. (A) Representative FACS plots of Csf2rb and Ter119 staining in primitive blood cells from E10.5 embryos of the indicated genotypes. Percentage of cells in each gate is given. N ≥ 3 for all genotypes. (B) Representative FACS plots of Csf2rb and c-Kit staining in the primitive blood of E8.5 embryos of the indicated genotypes. N ≥ 3 for all genotypes.