undifferentiated epithelial cell of urothelium of primitive bladder true EMAPA:36085 undifferentiated epithelial cell of urothelium of primitive bladder (syn: endodermal epithelial cells of urothelium) (TS:19-TS:20): a very small number of these cells are present in the early embryonic urothelium of primitive bladder from TS:19-20. These cells are defined by their expression pattern and location in the urothelium. They express Foxa2, Trp63, Shh and Isl1. They do not express Uroplakin or Krt5. They are usually located at the luminal surface of the urothelium. anatomical_structure undifferentiated endodermal cell of urothelium of primitive bladder