Connexins, such as GJA9, are involved in the formation of gap junctions, intercellular conduits that directly connectthe cytoplasms of contacting cells. Each gap junction channel is formed by docking of 2 hemichannels, each of whichcontains 6 connexin subunits (Sohl et al., 2003 (PubMed 12881038)).(supplied by OMIM)