Fig. 5.

Fabrication and characterization of the microgel composite hydrogel. A) Procedure used for the fabrication of the microgel composite hydrogel. B) Monodispersed AlMA microgels and particle size distribution. C) Swelling behaviors of hydrogels with different microgel contents. D) Compression tests of hydrogels with different microgel contents. E) Results of the strain-sweep tests. F) Degradation of GelMA hydrogels and composite hydrogels with a 1:10 AlMA/GelMA mass ratio. G, H) Release profile of BMP-2 and Mg²⁺ in AlMA microgels or composite hydrogels. I) The distribution of red fluorescence-labeled AlMA microgels in the hydrogels. J) Expression of Opn in BMSCs on hydrogels as detected by CLSM.