(A) Images of HEK293T cell medium exosomes under a transmission electron microscope. (B) Labeled proteins for exosomes are determined via WB and assessed by gray analysis. (C) Exosomes stained with PKH67 fused into HCC cells. (D) Measurement of miR-199a-3p expression levels in HEK exosomes by qRT-PCR. (E and F) Possible target protein expression levels in Huh-7 (E) and Huh-7/DDP (F) cells are tested by WB; **P<0.01; ***P<0.001. All error bars are S.E.M.