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MS/MS spectra of peptides from fibrinogen-like 2 and complement component 4A analyzed using QToF. The spectra A and B show the N-glycosylation sites of the peptide LDGST*NFTR from fibrinogen-like 2 and GL*NVTLSSTGR from complement component 4A respectively (where *N indicates the N-glycosylation site modified by 18O). Spectrum shows the conversion of Asn to Asp after PNGase F treatment
