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Flow Cytometric Analysis of Apoptosis in MCF7 (A) and MDA-MB-231 (B) cells induced by various concentrations of Arctium lappa root extract (0, 0.1, 1 and 10 µg/ml) for 72 hours. The cells in Q1 are necrotic cells which are labelled only with PI. Cells in the Q2 are late apoptotic cells, which are labelled with both PI and Annexin V. Normal cells are in Q3 that are not labelled with PI or Annexin V. In Q4 cells are labelled only with Annexin V and are early apoptotic cells
