The common single nucleotide polymorphism (SNP) in the promoter region of the gene MUC5B that encodes muc5B protein (MUC5B rs 35705950T allele) as well as the rest of the common SNP associated with IPF is shown in Figure 2 [30,55,216,217,218,219,220,221,222]. Here, MUC5B is linked to idiopathic pulmonary fibrosis.