Fig. 4

Comparison analysis of the altered glycopeptides in OA cartilage. a Profiling of three increased glycopeptides and three decreased glycopeptides in OA cartilages. b Protein–protein interaction network analysis of the significantly decreased (left) or increased (right) glycoproteins in OA cartilage. c Biological process, d cellular component, e molecular function, and f KEGG pathway analysis of significantly differential glycoproteins in OA cartilage. g Frequencies of altered site-specific glycans in OA cartilage. h The PSMs of glycopeptides modified with pauci- and high-mannose type of N-glycans and fucosylated N-glycans in the differential glycopeptides