What is the Extracellular Matrix made of?

1. Fibrous proteins: such as collagen and elastin, which make fibers that provide strength and flexibility 2. Hydrated gel-like matrix containing protein-polysaccharide complexes called proteoglycans, which are glycoproteins with glycosaminoglycan linkages. 3. Adhesive glycoproteins such as fibronectin and laminin, that link components of the matrix to one another and to cells via cell surface receptors