| http://www.w3.org/ns/prov#value | - In preferred embodiments of the invention, the substrate is an organic material selected from proteinaceous substances such as keratin, as found in hair, skin, nails and certain other body parts, other naturally occurring protein-based materials, e.g., silk, or a saccharide derived substance such as cellulose or a cellulose derivative, e.g. a natural product such as cotton.
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