Collagenase Article 1 Biosensing Techniques 1 Biosensors 1 Click chemistry 1 Clofibrate 1 Collagenases 1 Cross-Linking Reagents 1 Crosslinking 1 Degradable hydrogel 1 Diseases 1 Drug delivery 1 Ethylene glycol 1 Gold coatings 1 Gold deposits 1 Hepatocyte 1 Hydrogel degradation 1 Hydrogel, Polyethylene Glycol Dimethacrylate 1 Hydrogels 1 Limit of Detection 1 Liver micronucleus assay 1 Lower detection limit 1 Norbornenes 1 Peptide cross-links 1 Peptides 1 Poly(ethylene glycol) hydrogel 1 Poly(ethylene glycol) norbornene 1 Polyethylene Glycols 1 Polyethylene glycols 1 Polyols 1