| http://www.w3.org/ns/prov#value | - It will be evident to those skilled in the art that a variety of bifunctional or polyfunctional reagents, both homo- and hetero-functional (such as those described in the catalog of the Pierce Chemical Co., Rockford, Ill.), amino acid linkers (typically, a short peptide of between 3 and 15 amino acids, and often containing amino acids such as glycine, and/or serine), and polymers (e.g., polyethyle
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