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The DNA fragmentation of MDA-MB-231 cells treated with various drugs for 2, 4 and 6 days. Lane M Lambda DNA/HindIII Marker; Lane 1 genomic DNA extracted from untreated cells; Lane 2 cells treated with 0.2 % DMSO; Lane 3 30 µM PGZ; Lane 4 3 µM MK886; Lane 5 30 µM PGZ + 3 µM MK886; Lane 6 0.25 µM camptothecin; Lane 7 5 µM tamoxifen
