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Positive-ion ESI-MS of the Arg-C-produced Neurospora H3 peptide 9KSTGGKAPR17 with K9 being methylated (A) or acetylated (B). Shown in (C) and (D) are the MS/MS, obtained on the Q-TOF mass spectrometer, of the tri-methylated and acetylated peptides with residues 9-17.
