Identification and purification of CD34⁺flt3⁺and CD34⁺flt3^-cells. (A) CD34-enriched cells were stained with an anti-flt3 or an irrelevant control antibody. CD34⁺flt3⁺and CD34⁺flt3^-cells were sorted using the indicated sort gates. Figure shows representative profile for adult bone marrow. (B) Purity analysis of sorted populations.