A cell junction is a structure within a tissue of a multicellular organism. Cell junctions are especially abundant in epithelial tissues. They consist of protein complexes and provide contact between neighbouring cells, between a cell and the extracellular matrix, or they build up the paracellular barrier of epithelia and control the paracellular transport.
In vertebrates, there are three major types of cell junctions:
Cell junction molecules
The molecules responsible for creating cell junctions include various cell adhesion molecules.