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MS/MS spectrum corresponding to the fragments from a doubly charged peptide with m/z 908.38 (that is, y9). Sample was digested and analyzed by LC-MS/MS, and the digestion product was separated by gradient elution with the Dionex capillary/ nano-HPLC system and analyzed by Applied Biosystems QSTAR XL mass spectrometer using information-dependent, automated acquisition (Proteomics Resource Center of the Rockefeller University).
