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SSd increased apoptosis in SMMC-7721 and HepG2 cells. (A) The tumor cells were treated with SSd at various concentrations or vehicle (control) and analyzed by flow cytometric analysis. (B) Apoptosis rates in all treatment groups are presented as a histogram (data were expressed as mean ± SD). (C) Western blots of Bax (a pro-apoptotic protein), CDK6, Bcl-2, and cyclin B1. β-Actin was used as a loading control
