| http://www.w3.org/ns/prov#value | - Radioisotopic labels include 3 H, 35 S, 32 P, 125 I, and 14 C. Nonradioisotopic materials can also be used as labels and include, but are not limited to, haptens or other ligands, fluorescers, chemiluminescers, chromophores, and participants in enzymic reactions, such as enzymes, enzyme cofactors, enzyme substrates, and enzyme inhibitors.
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