| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 4,107,288 discusses particles in a size range from about 10 to about 1000 nanometers formed of a cross-linked matrix of macromolecules which can include gum, soluble cellulose, or proteins such as gelatin or albumin, and which a biologically or pharmacodynamically active material is supported on or incorporated into these cross-linked matrices.
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