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Effect of ATO on cell growth and apoptosis. (A) MTT assay was used to measure cell proliferation in MCF-7 and SK-BR-3 cells after ATO treatment for 72 hours. *P<0.05, **P<0.01, ***P<0.001, compared with control. (B) Apoptotic cell death was examined using Annexin V-FITC/PI method in breast cancer cells after ATO treatment for 48 hours.
