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Shikonin promotes apoptosis of 4T1 cells. (A) Representative scatter plots of the apoptotic status in 4T1 cells in the 48-h PBS, DOX, LD-SK and HD-SK groups. (B) Statistical analysis of apoptosis of 4T1 cells (percentage of cells in Q2 and Q3) after the different treatments. Data are presented as mean ± SEM (n = 3); *P < 0.05, **P < 0.01
