| http://www.w3.org/ns/prov#value | - (c) contacting the reaction products in each aliquot with a labeling moiety to covalently attach a label to one terminus of the reaction products to form a labeled reaction product mixture, wherein each aliquot is labeled with a label containing a different number of elements having an atomic number from 17 to 77, with the proviso that said elements are other than sulfur or phosphorus;
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