H69 cells were cocultured with the quantity of EVs that corresponded to 1.2 µg/mL of ES protein in PBS for 30 minutes, 3 hours, and 16 hours. Cells were washed using PBS containing protease inhibitor cocktail and lysed in 5 M urea, 2 M thiourea, 0.1% sodium dodecyl sulfate (SDS), 1% Triton X–100, and 40 mM Tris (pH 7.4). Each sample was ground with a TissueLyser II (Qiagen) and centrifuged at 12 000g for 20 minutes. The protein supernatant was precipitated with cold methanol and centrifuged at 8000g. Air-dried pellets were redissolved in 0.5 M triethylammonium bicarbonate (TEAB)/0.05% SDS and then centrifuged at 12 000g. Samples were resuspended in 0.5 M TEAB prior to reduction, alkylation, digestion, and iTRAQ labeling (AB Sciex) and then were analyzed on a 5600 TripleTOF mass spectrometer as described previously [24 (link)].