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The compositions of exosomes. Exosomes are composed of in a variety of bioactive substances, mainly proteins, nucleotides and lipids. Proteins include tetraspanins (e.g., CD9, CD63, and CD81), heat shock proteins (e.g., Hsp70, Hsp90), cytoskeletal proteins (e.g., Actin, Fibronectin), viral proteins (e.g., Tsg101) and enzymes. Nucleotides include RNA and DNA.
