| http://www.w3.org/ns/prov#value | - wherein X is an amino acid or an oligopeptide having from 1 to 8 amino acid residues, the first amino acid residue at the N-terminus of X being a natural or a synthetic L-amino acid with a radius of gyration less than 1.54 ???, X further having a carboxyl or a carboxyamide moiety at its carboxy terminus; and
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