Fig. 6

Cellular internalization study of free Dox and Fe-GSH-Protein-Dox (A) in MDA-MB-231 cells, and the results were observed after 1 and 4 h of incubation (A).The histogram and a bar graph were used to demonstrate the amount of NPs taken up by MDA-MB-231 cell lines using flow cytometry, with a statistical significance of p < 0.01 (B).