| http://www.w3.org/ns/prov#value | - Examples include biocompatible viscoelastic materials such as hydrophilic polymers, hydrogels, homopolymer hydrogels, copolymer hydrogels, multi-polymer hydrogels, or interpenetrating hydrogels, acrylonitrile, acrylic acid, acrylimide, acrylimidine, including but not limited to PVA, PVP, PHEMA, PNVP, polyacrylamides, poly(ethylene oxide), polyvinyl alcohol, polyarylonitrile, and polyvinyl pyrrolid
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