HeLa cells were cultured in DMEM supplemented with 10% FCS as previously described [16 (link)].
ICRF-159 (Razoxane) was provided by Sigma Aldrich (R8657) and was added to the cell culture medium at a final concentration of 1 or 10 µM following the protocol described in figures 1a, 2c, 3a, 4a and electronic supplementary material, figure S2A. Thymidine was provided by Sigma Aldrich (T9250) and was added to the cell culture medium at a final concentration of 2 mM.
All cells were routinely checked for mycoplasma infection.
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