Fig. 7

NK cells improved PA-induced lung injury through secreting exosomes. a H&E staining was used to analyze the pathological changes in lung tissues. The scale bar is 25 μm. b CFU counting was accomplished to examine the bacterial burden in the right lung tissues of each mouse. c and d The percentage of neutrophils and lymphocytes in lung tissues of each moues was measured by flow cytometry. *P < 0.05 and **P < 0.01 compared with NK (-) group