Fig. 6. (a) An example tandem MS of the crosslinked peptide, NAKFYPVTR(3)-EKVNDQAK(2). (b) Some protein–protein interactions based on the identified crosslinked peptides. The proteins also found in the data set of the surface glycoprotein interactors from quantitative proteomics were colored in light green and proteins from the data set of surface glycoproteins identified in this work were in orange. (c) Protein–protein interaction network constructed from the IntAct database. Proteins identified based on the crosslinked peptides were in dark blue and the remaining proteins from IntAct were in light blue. The identified interactions were colored in red and the known interactions from IntAct were in gray.