Additionally, immunostaining for CD45, a marker of inflammatory cells, confirmed that intratracheal exposure to BLM resulted in an increase in CD45 positive cells infiltrating into the lungs, compared with sham, while there were significantly less CD45 positive cells in the lungs of ALI mice that received TSCs compared with ALI mice receiving PBS or FBs (Fig. 1e–i). This evidence concerns the gene PTPRC and acute respiratory distress syndrome.