GelMA (Gelatin Methacryloyl), with 90% methacrylation and green fluorescence, is a modification of gelatin achieved by grafting fluorescent molecules onto the polymer. Green Fluorescent Gelatin Methacryloyl acts as a scaffold beneficial for creating tissue analogs ranging from the vascular system to cartilage and bone, promoting cell proliferation and diffusion. In the presence of the photoinitiator LAP, GelMA self-assembles into fibrous hydrogels that target bioactive adhesion sites, providing essential support and biodegradability for tissue cells. Applications encompass cell culture, bio 3D printing, tissue engineering, among others.