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Combination treatment with Res and SFN reduces the expression of markers for cell proliferation and cell cycle progression. U251 cells were treated with 25 μM of Res, 25 μM of SFN or the combination of Res and SFN for 24 h. Western blot analysis of PCNA (a) and cyclin D1 (b) was performed. Changes of expression were shown by densitometric analysis. *: P < 0.05, ***: P < 0.001, vs. Con; *Δ: P < 0.5 vs. Res; n = 3
