PDGFRB and Diffuse mesangial sclerosis: While Sox2Cre::Pdgfrb+/K::Stat1+/− mice die at 3 weeks of age, 9‐week‐old Sox2Cre::Pdgfrb+/K::Stat1−/− mice closely resembled the phenotype of Foxd1Cre::Pdgfrb+/J mice, with mesangioproliferative glomerulonephritis, mesangial sclerosis, and interstitial fibrosis (Fig EV4).