Following transduction with the MFM vector, CD34-selected cord blood cells were plated in methyl-cellulose assays with cytokines or CID, as marked. The resulting colony numbers are displayed per 1000 cells. AP1903 alone was capable of supporting BFU-E development but not a CFU-GM development. The addition of SCF and IL-3 to the culture resulted in a synergistic effect on BFU-E development. It should be noted that 20% of colonies were transduced and therefore capable of responding to CID.