A, Lymph is collected at the thoracic duct, between the transverse lumbar artery and the diaphragm in a collection tube coated with EDTA (0.1 M). B, Representative picture of translucent collected lymph. C and D, Red blood cells (RBCs; C) and platelet (D) counts in blood, spun blood (plasma), and unprocessed lymph (n=3). E, Efficient flow cytometry quantification of PEV in lymph was verified by spiking and serial-dilutions of in vitro-generated PEV in either lymph or PBS. Nondiluted (ND), n=3. F, Sensitivity to Triton 0.05% of the PEV quantified by flow cytometry (n=4). G, PEV were quantified in platelet-free plasma and in lymph in C57BL/6 wild-type mice (n=5).