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Schematic illustrations showing the formation of three “ABA”three‐stage PEG‐based hydrogels:a) Dox‐loaded PEG”ABA” hydrogel; b)Vaccine‐loaded “ABA” hydrogel; c) vitamin E‐PEG‐vitamin E triblock”ABA” hydrogel. Reproduced with permission.[ 132 , 133 , 134 ] Copyright 2017, American Chemical Society, Copyright 2019, Elsevier, Copyright 2019, Elsevier.
