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NU7441 (0.3 μM) enhances cellular senescence in irradiated H1299 cells. Cellular senescence after indicated treatments was determined by analyzing SA‐βGal using flow cytometry in A549 cells (a) and H1299 cells (b) and p21 expression in both cells (c) using western blotting 3 days after 4 Gy of irradiation. Data represent mean ± SD from at least three independent experiments.
