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The effect of curcumin on apoptosis in U251 cells. (A), (B), and (C) show the apoptosis rate of U251 cells treated with NC, 20, and 30 μM curcumin, respectively. (D), (E), and (F) show the apoptosis rate, early apoptosis rate, and late apoptosis rate of U251 cells treated with curcumin at the corresponding concentrations, respectively. *P < 0.05 and **P < 0.01.
Abbreviation: NC, negative control.
