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Representative Western blots for P-gp in LS-180 cells treated with rifampicin, verapamil, dexamethasone, and hyperforin. Cells were treated for 48 h with increasing concentrations of the indicated drugs in the range of 5–100 μM except for hyperforin (25–150 nM). P-gp protein expression was analyzed by immunoblotting with C-219 primary antibody.
