“…Additionally, combinations thereof may be used in order to obtain end-use-specific properties. Thus, hydrogels based on different natural polymers (alginate [ 10 , 11 ], gelatin [ 12 , 13 ], cellulose [ 14 , 15 ], collagen [ 16 , 17 , 18 ], fibrinogen [ 19 , 20 ], hyaluronic acid [ 21 , 22 , 23 ]) or synthetic polymers (such as polyacrylamide [ 24 , 25 ], polyurethane [ 26 , 27 , 28 , 29 ], poly-(ethylene glycol) [ 30 , 31 ]) have been explored for the development of biomaterial inks. Naturally sourced bioactive polymers demonstrate superior biofunctionality over synthetic ones.…”