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The intracellular doxorubicin amount in adriamycin-resistant K562 tumor cells. Doxorubicin uptake into the adriamycin-resistant K562 tumor cells after incubation with different drug concentrations of micellar doxorubicin and doxorubicin solution for 2 hours.
Notes: *P < 0.05; **P < 0.01.
