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. Author manuscript; available in PMC: 2018 Oct 31.
Published in final edited form as: ACS Nano. 2015 Jul 23;9(8):8004–8011. doi: 10.1021/acsnano.5b01514

Figure 2.

Figure 2.

Depiction of the enzyme induced chemical-to-physical cross-link transition. When the nanocomposite is exposed to chymotrypsin, the CYKC peptides are catalytically cleaved. This imparts pendant network chains with enough mobility to physically adsorb onto the surface of the silica NPs causing the hydrogel to collapse.