Figure 4.

(a) Schematic illustration of the preparation of FA-targeted PEI/DOX complexes. (b) Confocal microscopic images of HeLa cells treated with FA-targeted or nontargeted PEI/DOX at a DOX concentration of 10 μg/mL (white arrows indicate drugs that were taken up by cells). Reproduced with permission of [57]. Copyright 2017, the Royal Society of Chemistry.