IL-17 induced HSP47 as well as type I collagen in human intestinal myofibroblasts Honzawa et al. (2014) IL-17 contributed significantly for stricture development in CD Yagi et al. (2007) level of fecal IL-17 was elevated in patients with active CD Biancheri et al. (2013). This evidence concerns the gene IL17A and Cowden disease.