CXCL5 and lung disorder: CD45−EpCAM− stromal cells were additional sources of CXCL5 in neutrophilic allergic airways, bolstering the expanding knowledge about immunological functions for stromal cells during lung diseases.95–99 Which cell types within the structural cell fraction are CXCL5 producers is unclear but may include peribronchial fibroblasts, airway smooth muscle cells, pericytes, and/or endothelial cells.73,100–104