Delayed engraftment of NOD/SCID mice transplanted with fresh and ex vivo–expanded CD34⁺ cells. The figure represents the mean values of CD45⁺ and double-positive CD45⁺/CD34⁺ cells in the femoral BM of NOD/SCID mice shown in Fig 4, which were transplanted with fresh (▪) and with cells incubated in the presence of IL-3/IL-6/SCF (▩) and IL-11/SCF/FL (□). For further details, see legend to Fig 4.