GelMA (Gelatin Methacryloyl), with 60% methacrylation and Green Fluorescent properties, is a type of methylated gelatin incorporating fluorescent molecules. This compound functions as a scaffold for creating tissue analogs, such as those resembling the vascular system, cartilage, and bone, promoting cell proliferation and diffusion. To form fibrous hydrogels, GelMA requires the action of a photoinitiator LAP, allowing it to target bioactive adhesion sites to support and degrade in tissue cells. It is applicable in fields like cell culture, bio 3D printing, and tissue engineering.