The fine structure of the transitional epithelium of rat ureter has been studied in thin sections with the electron microscope, including some stained cytochemically to show nucleoside triphosphatase ...

Permeability barriers must exist in transitional epithelium to prevent the free flow of water from underlying blood capillaries through the epithelium into the hypertonic urine, and such a barrier has ...

Epithelial cells, which line the body's surfaces and cavities, can be organized into a multi-layered tissue called squamous epithelium (as in the oesophagus and skin) or a single layer of columnar ...