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(a) Schematically illustrated synthesis of APTF hydrogel based on Alg-NHS, PEGDA, and TA/Fe3+. (b) Molecular interactions among the building blocks of APTF hydrogel: (i) TA crosslinked PEGDA network (ii) TA/Fe3+ crosslinked PEGDA network and (iii) TA/Fe3+ crosslinked AP network.
