Cell growth inhibition by c-kit antisense oligonucleotides. Untreated and treated 6647 cells (sense or antisense oligos 2 μmol/L) incubated 7 days at 37°C 5% CO₂. (A) Absolute number of cells, mean of three different experiments. (□), mean; (□), SD; (⊥) SEM. (B) 6647 oligos-treated cells were incubated in triplicate for 6 hours with 4 μCi/mL of³H-thymidine. (□), mean; (□), SD; (⊥), SEM. The differences between treated and untreated cells showed a statistical significance (P < .001).