Fig. 2.

(A) Three approaches that have been explored in the enzyme-driven formation of hydrogel materials. (B) An example from ref. 61, of the enzyme-directed cleavage of a peptide that results in formation of a hydrogel. ^aReferences are given as examples of each of the three systems – see main text for other relevant examples. Photographic images are of vials containing gels or aqueous solutions of peptide, adapted from ref. 61.