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Identification of exosomes in serum. (A) The morphology of serum exosomes was visualized by transmission electron microscopy (TEM). (B) The size distribution and concentration of serum exosomes were assessed by nanoparticle tracking analysis (NTA). (C) The specific exosome marker protein (CD9 and CD63) and non-exosomal protein (Tubulin) in serum exosomes and exosomes-depleted serum (EDS) were detected by western blot analysis.
