Special transmembrane proteins which make up gap junctions is called as

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