Fig 2: Proteins in serum exosomes. a GO analysis of the total 633 differentially expressed proteins was based on the LC-MS/MS results in the aspects of molecular function, cellular component, and biological process; b 10 proteins were significantly differentially expressed; c Western blot showed that the level of PZP in serum exosomes of IBD patients was significantly increased, n = 10; d Relative level of PZP. **p < 0.01; e ELISA showed that the level of PZP in serum exosomes of IBD group was higher than HC group, unpaired t-test, n = 30, ***p < 0.001