C/EBPδ deficient mice developed pulmonary fibrosis to a similar degreeas wildtype mice as evident from similar Ashcroft scores, hydroxyprolinelevels and expression levels of collagen, fibronectin and α-smoothmuscle actin at both 14 and 21 days after bleomycin instillation. The gene discussed is FN1; the disease is pulmonary fibrosis.