TGFB1 and pulmonary fibrosis: The αvβ6 integrin is expressed predominantly in epithelial tissues, activates TGFβ in vivo, and has been shown to be a critical mediator of lung injury in models of acute lung injury and pulmonary fibrosis (Morris et al., 2003; Munger et al., 1999; Yokosaki et al., 1996; Huang et al., 1996; Hogmalm et al., 2010; Massagué and Sheppard, 2023).