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Fig. 6. Triple labeling of mitotic Bsc-1 cells with antibody to topoisomerase II{alpha} (A, D), with antibody to topoisomerase IIß (B, E), and with the DNA stain DAPI (C, F). Cells exhibit labeling of mitotic chromosome arms with antibodies to both topoisomerase II{alpha} and topoisomerase IIß. Bar, 5 µm.