| http://www.w3.org/ns/prov#value | - The substrate component is selected from a) peptide derivatives Peptide-X-Y, where X is an amino acid or peptide residue and Y is OH, OMe or C-terminal modification and c) C-terminally esterified peptides, Peptide-OR', where R' is alkyl, aryl, heteroaryl, or aralkyl.
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