Effects of DNR, IDR, and MTA on apoptosis in cultures of HL-60 (A) and CEM (B) cells. Control and drug-treated cells were distributed in a 96-well microtiter plate at 0.75 × 10⁵(HL-60) or 1.25 × 10⁵ (CEM) cells per 250 μL complete medium and studied for 48 hours in the MiCK assay. Each point represents the mean (±SD) of three independent experiments.