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Human umbilical cord MSC‐derived extracellular vesicles (hUCMSC‐EVs) attenuated the atrophy of gastrocnemius muscles. A, Morphology of gastrocnemius muscles collected from hUCMSC‐EV or PBS (control) groups at 8 wk after sciatic nerve transection. B, Gastrocnemius muscle weight ratio (operation sides/normal sides) of rats under different treatments. C, H&E staining of gastrocnemius muscles. The scale bar represents 200 μm. n = 12. Data are presented as means ± SEM. *P < 0.05
