Exosomes derived from S. Typhimurium-infected RAW264.7 macrophages (24 and 48 hpi) were isolated by differential ultracentrifugation. Equal protein samples in triplicates were subjected to protein extraction and separation by SDS-PAGE. Protein bands excised from each lane were reduced, alkylated, and digested with trypsin. Peptide pools were desalted by C18 columns and analyzed by liquid chromatography-Orbitrap Fusion tandem mass spectrometry