A. The induction of topoisomerase I (Top 1)DNA complexes by EAD was measured using DNA cleavage assays as described in Materials and Methods. Doses of drugs: camptothecin (CPT) at 1 μM; EAD at 1, 10, and 100 μM. B. The induction of topoisomerase II (Top2)-DNA complexes by EAD was measured using DNA cleavage assays as described in Materials and Methods. Doses of drugs: etoposide at 0.1, 1, 10, and 100 μM; EAD at 0.1, 1, 10, and 100 μM.