response to acid, proteolysis, response to endogenous stimulus, response to organic substance, response to organic nitrogen, response to amine stimulus, collagen catabolic process, collagen metabolic process, response to cytokine stimulus, response to amino acid stimulus, multicellular organismal metabolic process, multicellular organismal catabolic process, multicellular organismal macromolecule metabolic process,
Secreted, extracellular space, extracellular matrix .