Fig. 4

Synthesis and structures of bioactive protein hydrogels: a SF-collagen composite hydrogels. Reprinted from Ref. [73], Copyright 2017, Elsevier b Metal sulfide-protein hybrid hydrogels. Reprinted from Ref. [75], Copyright 2017, Wiley–VCH. c TA-PVA/BSA hydrogels. Reprinted from Ref. [76], Copyright 2018, American Chemical Society. d Mfp3 hydrogels formed by photochemical gelation. Reprinted from Ref. [78], Copyright 2018, American Chemical Society