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Identification of PG0390 based on detection of a single peptide. (A) Total ion chromatogram. (B) Mass spectrum at 54.8 min. (Inset) Enlarged ICAT peptide ion pair at 703.9 and 708.4 m/z at a ratio of 1:2 (light to heavy). (C) Product ion spectrum for precursor 703.9 m/z. This peptide ion was identified as having the sequence LVDLNC*FDIK (MASCOT score = 40; C* denotes an ICAT-modified cysteine).
