The lack of changes in Cxcl13, Ccl11, Ccl19, Xcl1, and Cxcl5 mRNA levels may be due to differences in bleomycin-induced pulmonary fibrosis and IPF, although models of bleomycin-induced pulmonary fibrosis are the most common experimental models for investigating IPF. This evidence concerns the gene CCL19 and idiopathic pulmonary fibrosis.