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Schematic view of the Ac‐AG approach. (A) Isobaric labeling steps; (B) LC‐MS of a mixture of triplex‐labeled samples in DDA mode; (C) Functional design of the triplex‐labeled Ac‐AG‐PNP tag (13C isotope locations are marked with asterisk) [Color figure can be viewed at wileyonlinelibrary.com]
