| http://www.w3.org/ns/prov#value | - The polymer material constructing the polymer gel includes, for example, polysaccharides such as alginic acid, chitin, chitosan, hyaluronic acid, cellulose, the derivatives thereof and the like; proteins such as gelatin, collagen, casein, albumin and the like; polypeptides such as polyaspartic acid, polyglutamic acid, polylysine and the like; synthetic polymers such as polyvinyl alcohol (PVA), eth
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