(a–d) Confocal microscopy of Casp11−/− iBMDMs stimulated for 4 h with unlabeled EVs (a), FITC-LPS (b), FITC-LPS-EVs (c), or CellBrite Steady Membrane 488-labeled-EVs (d) and stained with anti-CD45, anti-EEA1 and anti-FITC antibodies to visualize plasma membrane, early endosomes and LPS, respectively. Arrows indicate intracellular localization of EV-bound FITC-LPS (c) or CellBrite 488-labeled-EVs (d). Images representative of two experiments are shown. Scale bar: 5 μm.