Gelatin Methacryloyl (GelMA) with 90% methacrylation and blue fluorescence is a modified form of gelatin achieved through the attachment of fluorescent molecules to GelMA. Green Fluorescent Gelatin Methacryloyl acts as a scaffold, facilitating the design of tissue analogs from vascular systems to cartilage and bone, promoting cell proliferation and migration. For GelMA with 90% methacrylation and green fluorescence, it requires the presence of a photoinitiator, specifically LAP, to self-assemble into fibrous hydrogels. These hydrogels target bioactive adhesion sites, providing inherent support for tissue cells and contributing to biodegradability. Applications include cell culture, bio 3D printing, and tissue engineering.