Figure 3

The internalization of PEGylated FA-FITC-MNPs in A549 and MCF-7 cells. The cultivated cells were treated with the FA-FITC-MNPs for 2 h and then subjected to the light and fluorescence microscopy analyses. A) DIC and FM superimposed image of the A549 cells. B) DIC, C) FM, and D) DIC and FM superimposed images of the MCF-7 cells. FA: folic acid. FITC: Fluorescein isothiocyanate. MNPs: magnetic nanoparticles. DIC: differential interference contrast. FM: fluorescence microscopy.