Effect of sense and antisense C/EBPε oligonucleotides on clonal growth of NB4 and HL-60 cells. The cells (10³ dish) were placed in soft agar that contained either sense or antisense C/EBPε phosphothiolated oligonucleotides (0.25 μmol/L) or diluant control; and dishes were incubated at 37°C in 5% CO₂ and colonies were enumerated on day 12 of culture. The results represent mean ± standard deviation (SD) of three independent experiments with each experimental point having three plates. Results are normalized to control plates containing diluant alone (100%).