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Expression of cell cycle-associated proteins regulated by steviol. (A) p21, p53, Cyclin D1, Cyclin E, CDK2. (B) Relative expression levels of cell cycle-associated proteins, calculated based on densitometric analysis. β-actin was used as an internal control. *P<0.05 and **P<0.01 vs. untreated cells. p21, cyclin-dependent kinase inhibitor 1; p53, tumor protein 53; CDK2, cyclin-dependent kinase 2.
