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(A) Synthesis of gelatin–Polyethylene glycol-acrylate (Gelatin-PEG) and elastin– Polyethylene glycol-acrylate (elastin-PEG) precursor. Gelatin and elastin were modified with free sulfhydryl group on the backbone via reacting with Traut’s Reagent. (B) Cell encapsulation in 3D hydrogel via UV photopolymerization. (NHDFs: Neonatal human dermal fibroblasts).
