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(A) Total ion chromatogram (TIC) and (B) ESI–FTICR–MS data of tryptic digest of stably expressed C97ZA012 gp140. The mass spectrum averaged within 37.23–38.51 min shows elution of four glycopeptide species. Asterisks (*) in the MS data denotes glycopeptide peaks. Glycan compositions of each observed glycopeptide peak in the mass spectra were verified from CID and ETD data.
