CEBPD and pulmonary fibrosis: Macrophage recruitment in response to inflammatory mediators produced by injuredepithelial cells is a key process in fibrosis Macrophage recruitment in responseto inflam-matory mediators pro -duced by injured epithelial cells is a keyprocess in fibrosis Macrophage recruitment by injured epithelial cells withsubsequent macrophage differentiation is a hallmark of pulmonary fibrosis,whereas C/EBPδ has been implicated in both these processes.