What are exosomes?

Exosomes are small (30 nm - 120 nm) extracellular microvesicles secreted by most cell types into the extracellular space. They transport bioactive molecules between cells, playing an important role in cell-to-cell communication. Exosomes can be found in nearly every bodily fluid, including blood, saliva, urine, tears, amniotic fluid, seminal fluid, synovial fluid and breast milk.