<prompt> Special transmembrane proteins which make up gap junctions is called asCadherinsOccludinsConnexonsClaudins  <response>: Communicating junctions gap junctions mediate the passage of chemical or electrical signals from one cell to another. The junction consists of a dense planar array of 1.5- to 2-nm pores called connexons formed by hexamers of transmembrane proteins called connexins. These pores permit the passage of ions, nucleotides, sugars, amino acids, vitamins, and other small molecules; the permeability of the junction is rapidly reduced by lowered intracellular pH or increased intracellular calcium. Gap junctions play a critical role in cell-cell communication.Ref: Robbin;s; 9th edition; Chapter 1; The Cell as a Unit of Health and Disease 