FN1 and asthma: Other studies showed that the gene and/or protein expression of collagen I [13,22,23], fibronectin [23,24,25,26,27], versican [28,29], elastin [7], tenascin C [30], periostin [31,32,33,34,35,36,37,38,39], and vimentin [40] was increased in ASMC and PF in asthma studies, including in vivo, ex vivo, in vitro, and animal model studies.