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SMART assay was performed as described35. Cells were incubated with BrdU (10 µM) for 24 h before treatment with CPT. DNA fiber stretching in silanized coverslip was performed using Fiber Comb® molecular combing system (Genomic Vision). Coverslips containing DNA fiber were used for YOYO-1 staining or native BrdU staining. Images were captured using Nikon AI confocal microscope and analyzed using ImageJ software (ImageJ 2.0 and 64 bit Java8 from https://imagej.nih.gov).

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