Red Fluorescent Gelatin Methacryloyl (Red Fluorescent GelMA) is methacryloyl gelatin (GelMA) with green fluorescence, which is obtained by “grafting” fluorescent molecules on GelMA. Red Fluorescent Gelatin Methacryloyl acts as a scaffold and can be used to engineer tissue analogs from the vasculature to cartilage and bone, allowing cells to proliferate and spread. Red Fluorescent Gelatin Methacryloyl is often used in cell culture, biological 3D printing, tissue engineering, etc^[1][2].