
Keywords: داربست رایگان; Tissue engineering; Bioprinting; Biomaterials; Scaffold-free; Cell spheroids; Kenzan method; 3DBP; 3D bioprinting; EC; endothelial cells; ECM; extracellular matrix; FB; fibroblasts; GelMA; metacrylate gelatin; HUVEC; human umbilical vein endothelial cells