| http://www.w3.org/ns/prov#value | - Typically, one of these concentrations serves as a negative control, e.g., at zero concentration or below the level of detection. [0098] A wide variety of assays may be used for this purpose, including labeled in vitro protein-protein binding assays, protein-DNA binding assays, electrophoretic mobility shift assays, immunoassays for protein binding, and the like.
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