HeLa WT and RAGE−/− cells were either left untreated or stimulated with hydroxyurea (HU) or glyoxal for 4 h. About 500 cells per well in six-well plates were seeded and incubated for colony formation. After 10 days, colonies were stained with 0.5% Crystal Violet (Sigma) for 20 min. The colonies were counted with OpenCFU (colony counting software). The percentage survival was calculated by normalizing the data with untreated (100%) (RAGE+/+ or RAGE−/−) cells.
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