| http://www.w3.org/ns/prov#value | - In one embodiment, the language ???substantially free of chemical precursors or other chemicals??? includes preparations B7-4 protein having less than about 30% (by dry weight) of chemical precursors or non-B7-4 chemicals, more preferably less than about 20% chemical precursors or non-B7-4 chemicals, still more preferably less than about 10% chemical precursors or non-B7-4 chemicals, and most pref
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