Although mature lens fibers lack cellular organelles, they still require nutriens. The fibers deep within the lens are far from the aqueous and vitrous, and fiber-to-fiber transport is important. An intracellular network of gap junctions facilitates movement of ions and small molecules between fibers. The lens has a higher concentration of gap junctions than other cells in the body; the lens gap junctions contain; some channel proteins that are unique to the lens.