Fig. 25. A. Gap junction (arrowhead) on the plasma membrane of a choroidal capillary endothelial cell. The junction lies close to an intercellular suture (× 62,000). B. Detail of gap junction (× 160,000) (Spitznas M, Reale E: Fracture faces of fenestrations and junctions of endothelial cells in human choroidal vessels. Invest Ophthalmol Vis Sci 14:98, 1975)