Fig. 2
 A Diagram of the projection-based 3D bioprinting device for the preparation of GM. B GM on the printing platform. C (a) GM under an optical microscope. (b) Coculture of TDSCs and GM. (c) Immunofluorescence staining of living (green) and dead (red) cells on GM. (d1) GM under SEM (× 30k). (d2) Surface morphology of GM under SEM(× 30k). (d3) Cross-section of GM under SEM (× 30k). D Visualization diagram of cell proliferation evaluated by CCK-8 (n = 3). E Enzymatic degradation of GM: a: 0 h; b: 2 h; c: 4 h; d: 8 h