Fig. 9.

(A) Schematic representation of the mode of action of positively charged nanoparticles (PEG-b-PAMAM/Pt) under acidic conditions, scale bar: 100 $\mu$ m. (B) Induction of apoptosis by nanoparticles under different pH environments. (C) Differential permeability of Cy5-labeled nanoparticles under different pH conditions. (Fig. 9A–C were reprinted with permission from Ref. [162]. Copyright 2016 American Chemical Society.).