MUC5B and idiopathic pulmonary fibrosis: Besides, Noth et al. [12] have identified other genetic variants as risk factors of IPF, including mucin 5B (MUC5B), desmoplakin (DSP), phospholipid transporting 11A ATPase, and toll interacting protein (TOLLIP), which play important roles in the maintenance of bronchoalveolar epithelium function and immune regulation [8].