Fig. 5. DNA damage, measured as the comet tail DNA (%) of HL-60 cells (A) and PBMCs (B) incubated for 2 h at 37 °C with the P7 derivative (10–50 μM) and etoposide (E) at 1 μM or 50 μM, analyzed by the alkaline comet assay. The figure shows mean results ± SEM, n = 100; **p < 0.01, ***p < 0.001.