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Effect of ginsenosides on heme oxygenase (HO)-1 induction in HPDL cells. The cells (1 × 106 cells/mL) were treated with 40 μM for the indicated time (0, 6, 12, 18, and 24 h) or with the indicated concentrations of each ginsenosides Re (A), Ra8 (B), and Rf (C) (5, 10, 20, and 40 μM) for 6 h. The expression of HO-1 was determined by Western blot analysis. * p < 0.05 was considered as significant differences between each treated group.
