| http://www.w3.org/ns/prov#value | - In one embodiment, the language ???substantially free of chemical precursors or other chemicals??? includes preparations of the variant protein having less than about 30% (by dry weight) chemical precursors or other chemicals, less than about 20% chemical precursors or other chemicals, less than about 10% chemical precursors or other chemicals, or less than about 5% chemical precursors or other ch
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