Influence of cellular activation of CD34⁺cells on cationic lipid-mediated ODN uptake. Cells were incubated for 2 hours with 0.3 μmol/L radiolabeled ODN complexed to DOTAP (□) or DOSPER (▪) with or without a 48-hour preculture in IL-3, IL-6, and SCF supplemented medium. The amount of cell-associated ODN was measured by liquid scintillation counting. The results of two experiments are indicated.