| http://www.w3.org/ns/prov#value | - yaluronic acid, as well as chitin, poly(3-hydroxyalkanoate)s, especially poly(??-hydroxybutyrate), poly(3-hydroxyoctanoate) and poly(3-hydroxyfatty acids). [0038] Representative natural biodegradable polymer segments or polymers include polysaccharides such as alginate, dextran, cellulose, collagen, and chemical derivatives thereof (substitutions, additions of chemical groups, for example, alkyl,
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