| http://www.w3.org/ns/prov#value | - The polymer matrix materials can be either natural or synthetic and include, but are not limited to, synthetic polymers such as polyethylene glycol (polyethylene oxide), poly(vinyl alcohol), polylactic acid, polyglycolic acid, and polyhydroxybutyrate, or natural polymers like collagen, fibrin, and gelatin, or polysaccharides like chitosan and alginate.
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