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(a) Protein polymer hydrogel formation by transglutaminase (TGase) enzymatic crosslinking. The top of (a) is engineered protein polymer as a lysine substrate and the bottom of (a) is random coil glutamine containing protein. (b and c) Photographs of the precursor solution before and after enzymatic gelation.
Reproduced with permission from [169]. Copyright 2010 Elsevier.
