Additional file 6. Identification of hUCMSC, primary astrocyte and hUCMSC-derived exosomes. A hUCMSCs were identified by the stem cell makers (CD73, CD90 and CD105) and nonstem cell markers (CD45, CD34 and HLA-DR) expression using flow cytometry. B Primary astrocytes were characterized by immunostaining of GFAP, S100β, Vimentin and morphology in bright filed. C The morphology of exosomes detected by transmission electron microscopy. Scale bar = 200 nm. D Diameters and concentrations of exosomes analyzed by...