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Four different profiles of four placenta crude exosome preparations (previously partially purified by several different centrifugations and filtration through filter 0.1 μm) purification by FPLC gel filtration on Sepharose 4B column: (—), absorbance at 280 nm (A280). Four different preparations of exosomes (A–D). One can see three peaks after gel-filtration (1–3).
