Association of TF in saliva with exosomes and P4 (membrane) particles. Fractions of microparticles and exosomes/P4 (membrane) particles were labeled with antibodies against CD133 and CD63, and analyzed by flow cytometry (A). Representative TEM images of exosomes/P4 (membrane) particles staining for CD133 (B) or CD63 (C) are also shown. Exosomes/P4 (membrane) particles were triple-labeled with anti-TF, anti-CD133, and anti-CD63, and analyzed by flow cytometry, summarized in panel D (n = 10).