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Mass spectrometry characterization and amino acid sequence determination. (A) Peptide masses values in peak 1 (left) and peak 2 (right) were determined by MALDI-TOF. The highlighted regions are widened in the insets. (B) The amino acid sequence of peptides from peak 1 was determined by ISD. (C) Alignment of the main peptide sequence of peak 1 (by MALDI-ISD) with that obtained by Edman degradation for peptides in peak 2.
