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Cell-cell junction composed of innexins or connexins, two different families of channel-forming proteins. Other proteins may also be present.
Gap junctions are one of three broad categories of intercellular connections that form between several animal cell types. They were first imaged using an electron microscope circa 1952. They were named in 1969 after the 2-4 nm gap they bridge between cell membranes. Gap junctions use protein complexes known as globules to connect one cell to another, and to connect vesicles within a cell to the ou... Wikipedia