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. 2020 Apr 22;15:2751–2764. doi: 10.2147/IJN.S238536

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© 2020 Hu et al.

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(A) Flow cytometry of HepG2 cells after 2 h incubation with the DOX-loaded complexes. Data are presented as mean ± SD. (n = 3, **P <0.01, ***P <0.001, N.S.: no significance). (B) Fluorescence microscope images of HepG2 cells after 2 h incubation with the DOX-loaded complexes (×100): (a) P-PEG/DOX, (b) HP-PEG/DOX, (c) HP-ss-PEG/DOX and (d) HP-ss-PEG-Tf/DOX (bar: 100 μm).