FIGURE 4.

Schematic illustrations of confocal laser scanning microscopy images of different types of nanoparticles and their targeting efficiency with different receptors. (A) CD 44 receptor—reprinted with permission from reference (Han et al., 2016), Copyright 2016, American Chemical Society; (B) Folate receptor—reprinted with permission from reference (Liu et al., 2019), Copyright 2019, American Chemical Society and (C) Transferrin receptor—reprinted with permission from reference (Sardoiwala et al., 2020), Copyright 2020, American Chemical Society.