FIGURE 1.
GJ structure. A, List of all expressed human connexins. B, Topological arrangement of connexin protein monomers. The cylinders represent transmembrane domains and the blue-boxed area represents the highly conserved region among different connexins, whereas the red-boxed area represents the highly divergent region. C, Connexon and GJ channel types. D, Topological arrangement of GJ channels. The GJ channel schematic is superimposed on a transmission electron micrograph of a GJ from canine cardiac tissue. Scale bar = 20 nm.