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M2 macrophage exosomes promote neurogenesis post-SCI. Representative images of NeuN+ (red), Nestin+ (red), and Sox2+ (red) cells in the anterior horn of the injured SC (A). Quantification the NeuN+ cells, Nestin+ cells, and Sox2+ cells in the injured SC (B–D). Mean ± SD. ** p < 0.01 SCI + saline group versus sham group, ## p < 0.01 SCI + Exo versus saline group. N = 5 per group. Bar = 50 µm.
