Any specialized areas of the plasma membranes of adjacent cells where the membranes are 2-4 nm apart and penetrated by a connexon.

The formation, from simpler components, of the cell wall. As in, but not restricted to, the taxon Bacteria (Bacteria, ncbi_taxonomy_id:2).

An assembly of six molecules of connexin, made in the Golgi apparatus and subsequently transported to the plasma membrane, where docking of two connexons on apposed plasma membranes across the extracellular space forms a gap junction.

Catalysis of the reaction: ADP-ribose + H2O = AMP + D-ribose 5-phosphate.

A belt-like region of very close contact between the plasma membranes of adjacent cells so that the intercellular space is completely occluded. They occur in epithelia and brain endothelia.

An adherens junction which connects a cell to the extracellular matrix.

Small region on the surface of a cell that anchors the cell to the extracellular matrix and that are points of termination of actin filaments.

A rigid yet dynamic structure surrounding the plasma membrane that affords protection from stresses and contributes to cell morphogenesis. Major components are glycoproteins and peptidoglycans including mannoproteins, glucans and sometimes chitin. Enzymes involved in cell wall biosynthesis are also found in the cell wall. Note that some forms of fungi develop a capsule outside of the cell wall under certain circumstances; this is considered a separate structure. As in, but not restricted to, the fungi (Fungi, ncbi_taxonomy_id:4751).

An adherens junctions formed between a muscle cell and a tendon cell; the muscle and tendon cytoplasmic faces are distinct.

outer membrane (sensu Gram-negative bacteria)

A lipid bilayer that forms the outermost layer of the cell envelope; enriched in polysaccharide and protein; the outer leaflet of the membrane contains specific lipopolysaccharide structures. As in, but not restricted to, the Gram-negative bacteria (Proteobacteria, ncbi_taxonomy_id:1224).

A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface. Each cilium is bounded by an extrusion of the cytoplasmic membrane, and contains a regular longitudinal array of microtubules, anchored basally in a centriole.