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10-Hydroxycamptothecin activates the cytochrome c and Bcl-2 signaling pathway of human osteosarcoma cells. Cytochrome c and Bcl-2 protein expression was analyzed using (A) western blotting analysis with (B) quantification of cytochrome c expression and (C) quantification of Bcl-2 expression. **P<0.01 vs. 0 µM. Bcl-2, B cell lymphoma-2.
