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Mass spectra of peptides with cysteinylation on Cys442 at 29.5 min and cysteinylation on Cys640 at 41.9 min in fraction 2. (A) MS spectrum of peak at 29.5 min with in-source fragments; (B) MS2 spectra of parent ion 597.79(+ 2) at 29.5 min; (C) MS spectrum of peak at 41.9 min with in-source fragments; (D) MS3 spectrum from fragment ion Y9 of peak at 41.9 min.
