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The connexin gene family codes for the protein subunits of gap junction channels that mediate direct diffusion of ions and metabolites between the cytoplasm of adjacent cells. Connexins span the plasma membrane 4 times, with amino- and carboxy-terminal regions facing the cytoplasm. Connexin genes are expressed in a cell type-specific manner with overlapping specificity. The gap junction channels have unique properties depending on the type of connexins constituting the channel.[supplied by OMIM]
