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Bufalin-induced cell apoptosis. (a) Inhibition of bufalin on the cell viability at 48 h after bufalin treatment. Cell viability was measured by the CCK-8 assay. **P <.05, compared with control. FCM analysis of apoptosis by annexin V/PI staining for control (b), treatment with STS (C), and treatment with bufalin for 24 h (d) or 48 h (e).
