Effect of dCF on the growth of U937 cells resistant to AraC or DNR.

Parent (▪), AraC-resistant (●), and DNR-resistant (▴) U937 cells were cultured with various concentrations of AraC (left panel), DNR (middle panel), or dCF with 10 μmol/L dAd (right panel) for 5 days. Values are means ± SD of 3 separate experiments.