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Intracellular uptake of DOX@SMPs-MON. (A) The confocal images of 4T1 cells treated with free DOX, DOX@SMPs and DOX@SMPs-MON (5 μg/mL of DOX) for 4 h and 6 h. Scale bars, 20 μm. (B) Flow cytometry analysis of 4T1 cells treated with free DOX and DOX@SMPs-MON (5 μg/mL of DOX) for 4 h and 6 h.
