| http://www.w3.org/ns/prov#value | - In some instances, P may be a peptide or a polypeptide, where the nucleophile is the amino acid cysteine, resulting in peptides of structures similar to H2N???CXXXXXCXXXXXC???COOH (SEQ ID NO: 4) or H2N???CXXXXXC???COOH (SEQ ID NO: 5), where C is the one-letter representation of cysteine, and X represents any amino acid except cysteine, in one embodiment, or Acetyl-NH???YXXXXXYXXXXXY???COOH (SEQ ID
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