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Cell viability of 4T1 cells treated with (A) H-L-D-Z NPs and (B) H-L-D-Z@PM NPs within 24 h. In vitro viability of HUVECs incubated with (C) H-L-D-Z NPs and (D) H-L-D-Z@PM NPs for 24 h. (E) Endocytosis of H-L-D-Z@PM NPs. Scale bars: 10 μm **p < 0.01, ***p < 0.001.
