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Chemical structure of alginate (A) with permission from reference [69], Copyright Elsevier, 2003. The gelation and printability of different molecular weight alginate bioinks with Ca2+ (B) with permission from reference [61], Copyright Springer Nature, 2017. The coupling strategy of the tripeptide arginine-glycine-aspartic acid sequence with alginate (C) and the increased adherence of the cells to modified alginate (D) with permission from reference [70], Copyright Elsevier, 2015.
