Red Fluorescent Gelatin Methacryloyl (Red Fluorescent GelMA) is a variant of methacryloylated gelatin with red fluorescence, achieved by grafting fluorescent molecules onto GelMA. It acts as a scaffold and is suitable for designing tissue analogs from the vascular system to cartilage and bones, facilitating cell proliferation and dissemination. With 30% methacrylation, Red Fluorescent GelMA requires light initiator LAP to self-assemble into fibrous hydrogels, targeting bioactive adhesion sites while providing inherent support and biodegradability. Applications include cell culture, biological 3D printing, tissue engineering, and more.