CPC G01N 30/8665 (2013.01) [G01N 2030/027 (2013.01); G01N 2030/047 (2013.01); G01N 2030/8831 (2013.01); H01J 49/0009 (2013.01)] | 20 Claims |
1. A peptide mixture comprising three or more distinct-mass versions of each of three or more distinct-sequence peptides, wherein two or more of the distinct-mass versions of each distinct-sequence peptide comprises one or more amino acids with above natural-abundance levels of one or more heavy isotopes, and wherein the distinct-sequence peptides:
do not contain one or more of tryptophan, methionine, cysteine, proline, asparagine, glutamine, or histidine residues; and/or
do not contain internal lysine or arginine residues.
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