Fig. 4

hpMSC-derived exosomes promoted the functional recovery of spinal cord injured animals by activating endogenous progenitors. a Representative images of GFAP and SOX2 immunofluorescence analysis. b Quantification of GFAP⁺SOX2⁺ cells. c Representative images of PAX6 and Nestin immunofluorescence analysis (scale bars 50 μm). d Quantification of PAX6⁺Nestin⁺ cells. e Representative images of SOX1 and Ki67 expression in the injured spinal cord of SCI-exosomes group and f SCI-control group. g Quantification of SOX1⁺Ki67⁺ cells. Data is presented as mean ± SD (n = 6). *p < 0.05 was considered significatively different