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Tandem mass spectra of the modified versus nonmodified doubly protonated peptide precursors. Panel A shows the modified versus nonmodified peptide NH2-IEAIRGQILSK-COOH originated from transforming growth factor beta-1 proprotein (TGFB1_HUMAN). Panel B shows the modified versus nonmodified peptide NH2-EMSGDVRDAFVAIVQSVK-COOH originated from annexin (E5RK69_HUMAN).
