SMN1 and pulmonary fibrosis: Through the establishment of lung-epithelial specific <υ>β</υ>-gal reporter mice, double positive cells expressing <υ>β</υ>-gal and myofibroblast marker (<υ>α</υ>-SMA) demonstrated EMT in situ under TGF-<υ>β</υ>-inducing pulmonary fibrosis (38).