STAT1 and acute respiratory distress syndrome: The expression of MyD88, STAT1, and phosphorylated STAT1 was downregulated in miR-7704- (LPS/miR-7704) and IT-sMSC-exo-treated (LPS/IT-sMSC-exo) groups, but not in ALI mice injected with IT-sMSC-exo plus anti-miR-7704 (Figure 6K).