connexin [conexus = conjunction, connection ]: connexin proteins rank among a group of transmembrane proteins, which incorporate into the cell membrane. Six connexins are clustered to form a connexon, a structure, with a pore in the center, as one half of the channel. Two connexons in neighbouring cells connect to so called "gap junctions". The opening of this channel is controlled by the cell, and the channel is permeable for low-molecular substances (ions, small molecules, very, very small proteins).

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