| http://www.w3.org/ns/prov#value | - The term ???collagen??? herein thus refers to not only the specific class of macromolecules known as collagen but those natural materials that normally or naturally form membranes with collagen such as laminin, keratin, glycosaminoglycans, proteoglycans, pure carbohydrates, fibrin, fibronectin, hyaluronic acid or the like, and other natural materials that come into contact with collagen that can b
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