| http://www.w3.org/ns/prov#value | - By way of example, the shell may be a natural polymer, optionally chemically modified, for example, a polysaccharide such as agarose, dextran and cellulose derivatives such as carboxymethylcellulose; a protein such as gelatin and an albumin polymer; and a synthetic polymer, optionally chemically modified, such as acrylic or methacrylic acids.
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