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Immunodetection of ABCB1 in A549 (A), HepG2 (B) and SW620 (C) cells treated with 25 and 50 μg/cm3 Ag20 for 2, 6 and 24 h. MDR1/ABCB1 Sf9 insect membrane was used as a positive control for the presence of ABC protein, and β-actin serves as an internal control.
