Although WT1+ mesothelial cells have been reported to proliferate and actively repair the peritoneal surface upon injury154, various models of peritoneal fibrosis (i.e. hypochlorite, daily intraperitoneal injection of dialysate or mouse TGF-β adenoviral administration) have reported a mesothelial and submesothelial origin for myofibroblasts in peritoneal fibrosis154,155. The gene discussed is TGFB1; the disease is Peritoneal Fibrosis.