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Chemical structure of (a) nature and (b) synthetic polymers. The chemical structure of alginate, fibrin, chitosan, hyaluronic acid, polyethylene glycol (PEG), polylactic-co-glycolic acid (PLGA) and pluronic were adapted with permission from [129]. Copyright 2017 Elsevier; silk and polyvinyl alcohol (PVA) were adapted with permission from [130]. Copyright 2017 Elsevier; polycaprolactone (PCL) and polylactic acid (PLA) [131]; agarose and gelatin [132]; collagen [133].
