Kinetics of engraftment of individual NOD/SCID mice transplanted with fresh and two different types of ex vivo– expanded CD34⁺ cells. The figure represents the individual kinetics of engraftment of NOD/SCID mice transplanted with fresh CD34⁺ cells (10⁵ cells/mouse; closed symbols) or with the ex vivo–expanded product generated after a 6-day incubation of 10⁵ fresh CD34⁺ cells in the presence of IL-3/IL-6/SCF (○) and IL-11/SCF/FLT3L (▵).