Methacrylated Type I collagen (Col1MA) is a methacrylated tissue engineering scaffold material. Methacrylated Type I collagen retains the essential properties of natural collagen, including spontaneous fiber self-assembly and enzymatic biodegradability. Methacrylated Type I collagen is capable of self-assembly into fibrous hydrogels, intrinsic support of tissue cells through bioactive adhesion sites, and its biodegradability. After photo-cross-linking CMA, the cell viability of encapsulated mesenchymal stem cells was protected^[1].