A wide pore channel activity that enables a direct cytoplasmic connection from one cell to an adjacent cell. The gap junction can pass large solutes as well as electrical signals between cells. Gap junctions consist of two gap junction hemi-channels, or connexons, one contributed by each membrane through which the gap junction passes. [ GOC:dgh https://www.worldcat.org/search?q=bn%3A0815340729 GOC:mtg_transport ]

Synonyms: innexin channel activity