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Nano-LC–MS/MS mass spectra of (A) doubly charged N-glycosylated peptide GLN*VTLSSGH (m/z = 553.28) from complement 4 and (B) doubly charged N-glycosylated peptide LANENN*ATFYFK from kininogen-1. The asterisk (*) denotes the site of N-glycosylation as determined from the tandem mass spectrum.
