Lungs from patients afflicted with severe IPF, displayed a high level expression of both active, phosphorylated RSK and phosphorylated C/EBPβ-Thr266 co-localized in activated LMF within the fibrous tissue, compared with samples from control patients (Figures 9 and S5). The gene discussed is CEBPB; the disease is idiopathic pulmonary fibrosis.