A<unk>  or nexus is a junction between certain animal cell-types that allows different molecules and ions, mostly small intracellular signaling molecules (intracellular mediators), to pass freely between cells. The junction connects the cytoplasm of cells. One<unk>  is composed of two connexons (or hemichannels) which connect across the intercellular space. They are analogous to the plasmodesmata that join plant cells.
Gap junction
Tight junction
Cell junction
Nuclear envelope
Cytoskeleton
Adherens junction
Apical membrane
Basolateral membrane