IPF, therefore, does not appear as a disease from an alteration of a single gene, although single mutations were found, such as those concerning the coding of the telomerase enzyme complex [64] or SNP, in particular in the gene encoding mucin 5B (MUC5B) [65], measurable on blood and BAL as well. The gene discussed is MUC5B; the disease is idiopathic pulmonary fibrosis.