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MALDI mass spectra obtained of a tryptic in-solution digest of ITITPNRITITPNV using Cl-CCA (A) or CHCA (B) as a matrix. Total peptide load: 1 pmol; magnifications by a factor of 3 (A) and 460 (B) of the quasimolecular ion region of [ITITPNV+H]+ are shown
