Fig. 3.

Preparation and characterization of F127-HA hydrogels. A The optical images of hydrogel sol–gel transition. B Morphology of hydrogel observed by SEM. C The injectable and thermosensitive hydrogel rapidly form gel when injected into the hot plate at 37 °C. D Storage modulus (G′) and loss modulus (G′′) of hydrogel as a function of temperature. E Degradation rate of the F127-HA hydrogels in PBS at 37 °C. F Release profile of exosomes from the F127-HA hydrogels in PBS at 37 °C