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Effect of verapamil in drug-resistant HCT8/ADR cells on intracellular uptake. (A) Verapamil's impact on free Dox. (B) Verapamil had little impact on NPs. (C) Fluorescence intensity in free Dox and TAT-PEG-Asp8-Dox group after verapamil treatment. (D) Relative increase of intracelluar Dox.
