Table 1.

CFC of fractions of Lin⁻cKit⁺IL7Rα⁻ FcγRII/III^loendoglin^lo adult bone marrow

	Colonies per 100 cells plated
Fraction	Blast	G	GM	M	Eo	Meg	% cKit+ fraction	Meg contribution (%)
Sca1−CD48+CD150−	2 ± 1	14 ± 5	9 ± 2	10 ± 1	0 ± 0	7 ± 1	36 ± 2	21
Sca1−CD48+CD150+	0.2 ± 0.2	0.1 ± 0.1	0.0 ± 0.1	0.3 ± 0.2	0 ± 0	24 ± 1	37 ± 2	68
Sca1+	18 ± 5	1 ± 1	3.5 ± 4	9 ± 4	0 ± 0	3 ± 2	19 ± 1	11

Mean colony counts ± SD per 100 cells from four replicate experiments using a combined stimulus of SCF (100 ng/mL), IL-3 (10 ng/mL), and EPO (4 IU/mL). Eo, eosinophil; G, granulocyte; GM, granulocyte-macrophage; M, macrophage; Meg, megakaryocyte colonies, including colonies of megakaryocytes and erythroid cells; Meg contribution, percentage contribution to megakaryocyte CFC of each fraction, calculated by adjusting contribution to percetage of cKit⁺ fraction by relative ability of cells to form megakaryocyte colonies; % cKit⁺ fraction, percentage contribution of each fraction to Lin⁻cKit⁺ IL7Rα⁻FcγRII/III^loendoglin^lo bone marrow with means ± SD from four mice (Fig. S1).