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gap junction (connexon)
channel forming complexes (connexon) which allow passive diffusion of small signaling molecules between cells, the type of molecules influenced by the particular connexin subunits in the gap junction. A connexon consists of a connexin hexamer.
Related
connexin (gap-junction protein)
General
intercellular junction
References
Bissell & Radisky. Nature Reviews Cancer 1:46-54, 2001