LILRB4 and acute respiratory distress syndrome: Previous studies have elucidated the effects of LILRB4 on LPS-induced ALI; however, conventional LILRB4 KO mice were applied in the present study, and it was not clear whether LILRB4 regulated the occurrence and development of ALI by regulating the function of pulmonary immune cells or pulmonary parenchymal cells (epithelial/endothelial cells).