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Flow cytometric analysis of DNA fragmentation of MCF-7 and MDA-MB-231 breast cancer cells after 24 h of incubation with PtPz1–PtPz6 (20 µM) and cisplatin (20 µM) using TUNEL assay. Histograms present TUNEL negative and TUNEL positive cells. Mean percentage values from three independent experiments (n = 3) done in duplicate are presented. *p < .05 versus control group.
