“…Gelatin in the form of methacryloylated gelatin (GelMA) is widely used in tissue engineering, particularly in the generation of bone, cartilage, skin, and vascular networks. 65,66 GelMA is a modied gel with photosensitive functional groups introduced into the gelatin side chain, 67,68 which retains the good biocompatibility and degradation properties of gelatin, forms covalent cross-linked hydrogels with good thermal stability under the action of UV light and photo-initiators, and shows good printing adaptability and biocompatibility in the eld of 3D bioprinting. 69,70 However, it is difficult to form biological scaffolds by extrusion 3D printing due to the poor mechanical properties and structural maintenance of GelMA crosslinked by light.…”