Fig. 6

haMSC-EVs alleviated lung injury in an LPS-induced ALI/ARDS rat model. A Histopathology showed that haMSC-EVs decreased the infiltration of inflammatory cells in the alveolar lumen and interstitium and reduced the thickening of the alveolar septum. B haMSC-EVs alleviated the degree of lung lesions (n = 10). − indicates no lesions, ± indicates few lesions, + indicates mild lesions, and + + indicates moderate lesions, +++ indicates severe lesions