| http://www.w3.org/ns/prov#value | - Reagents that interact specifically with a tag peptide also are known in the art and are commercially available and include antibodies and various other molecules, depending on the tag, for example, metal ions such as nickel or cobalt ions, which interact specifically with a His-6 peptide; or glutathione, which can be conjugated to a solid support such as agarose and interacts specifically with GS
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