Fig. 4

Biocompatibility of methacrylated gelatin (GelMA) and GelMA-Exos exosomes. GelMA and GelMA-Exos were embedded separately under the skin of mice. Seven days later, spleens and other major organs of the mice were collected, and immune cells were tested. a Flow cytometric analysis of immune cells in mouse spleens seven days after the subcutaneous implantation of gels. b Quantitative analysis of immune cells in the mouse spleen. c HE staining results of the major organs in mice