| http://www.w3.org/ns/prov#value | - The substrate surface may be formed of a conductive, nonconductive, semiconducting material, or the like, and may comprise, for example, glass, silica, alumina, plastic or other organic polymers, for example, acrylonitrile-butadiene-styrene copolymers, polysulfone, polystyrene, metals, bioerodable materials such as poly(glycolic acid), polyanhydrides, polyorthoesters, polylactic acid, or combinati
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