CD34 and in situ carcinoma: In all groups, we observed normal sized urothelial cells with accompanying nuclei and normal organization leading us to believe that the thickened urothelium seen in the Cyr61OX, Wnt5aOX, MSC, and MSC/CD34+ HSPC groups was secondary to urothelial hyperplasia as compared to hypertrophy or carcinoma in situ.