| http://www.w3.org/ns/prov#value | - Another ingredient other than the vinyl alcohol polymer includes any of those which neither inhibit the gelation of the vinyl alcohol polymer nor deteriorate the strength and transparency of the hydrogel, with no specific limitation, for example, including polysaccharide such as alginic acid or chitosan; polyamino acid such as polylysine, polyaspartic acid or polyglutamic acid; protein such as col
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