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Results of western blotting for CD63 (a) and electron micrograph showing size and morphology of exosomes purified from plasma of a child with juvenile dermatomyositis (b). Molecular weight markers (100-20 kD) are shown in the first lane of the left panel. The scale for the electron micrograph (100 nm) is shown in the lower right side of the right panel. Exosomes were prepared with the ExoQuick™ reagent from System Biosciences
