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. 2005 Feb 8;92(4):681–689. doi: 10.1038/sj.bjc.6602382

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Copyright © 2005 Cancer Research UK

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Histograms of DNA content of A549 (A–C) and Calu-6 (D–F) cells demonstrating the accumulation of cells in the S phase after topotecan treatment (B and E), and the minimal increase in the G1 phase after gemcitabine exposure (C and F) with respect to controls (A and D).