Connexins, or gap junction proteins, are a family of structurally related transmembrane proteins that assemble to form vertebrate gap junctions (an entirely different family of proteins, the innexins, form gap junctions in invertebrates). Each gap junction is composed of two hemichannels, or connexons, which are themselves each constructed out of ...
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http://en.wikipedia.org/wiki/Connexin
<cell biology, protein> A group of homologous proteins which form the intermembrane channels of gap junctions. ... They appear to be the major structural proteins of the connexon and are the products of an identified gene family which has both highly conserved and highly divergent regions. The variety contributes to the wide range of function...
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http://www.encyclo.co.uk/local/20973
Generic term for proteins isolated from gap junctions. It has been proposed that connexins are the major structural proteins of the connexon. However, this is still a matter of debate and connexins vary from tissue to tissue.
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Connexin: A subunit of connexon, a protein that forms a gap junction, a channel that permits ions and small molecules to move between adjacent cells. The connexins are important to intercellular communication. Historically, gap junctions were first characterized by EM (electron microscopy). They appeared to be specialized structures in the plasma m...
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http://www.medterms.com/script/main/art.asp?articlekey=16318
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