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Nanoparticle tracking analysis permits the determination of both the size distribution and relative concentration of microvesicles, including exosomes, in the supernatants of cultured cells and biological fluids. We have studied the release of microvesicles from the human lymphoblastoid T‐cell lines Jurkat and CEM. Unstimulated, both cell lines release microvesicles in the size range 70–90 nm, which...