fig3

Figure 3. In vitro EV release profiles of (A) Hydrogels without responsiveness of different crosslinking densities; (B) acid-responsive hydrogels crosslinked by amine-aldehyde conjugation; (C) enzyme-responsive hydrogels. Figure 3A adapted with permission^[105], Copyright 2021, Elsevier; 3B adapted with permission under terms of the CC-BY NC license^[63], Copyright 2019, the authors, published by Ivyspring International; 3C adapted with permission^[122], Copyright 2019, Royal Society of Chemistry. EV: Extracellular vesicle.