Figure 2. Gene Ontology (GO) enrichment analysis of peripheral blood mononuclear cells (PBMCs) in primary Sjögren syndrome (pSS) patients based on biological process, cellular component and molecular function. (A) GO enrichment analysis of up-regulated differentially expressed proteins (DEPs). (B) GO enrichment analysis of down-regulated DEPs. (C) Kyoto Encyclopedia of Genes and Genomes (KEGG) functional enrichment analysis of up-regulated differentially expressed proteins (DEPs). (D) KEGG functional enrichment analysis of down-regulated DEPs.