B C D Source: Barrett KE, Barman SM, Boitano S, Brooks HL Ganong'sReviewofMedicalPhysiologywww.accessmedicine.com Copyright c The McGraw-Hill Companies, Inc. All rights reserved. Different ways in which ion channels form pores. Many K channels are tetramers A), with each protein subunit forming part of e channe In ligand- gated cation and anion channels b) such as the acetylcholine receptor. five identical or very similar subunits form the channe Cl channels from the CiC family are dimers c), with an intracellular pore in each subunit Aquaporin water channels(D)are tetramers with an intracellular channel in each subunitDifferent ways in which ion channels form pores. Many K+ channels are tetramers A), with each protein subunit forming part of the channel. In ligand-gated cation and anion channels B) such as the acetylcholine receptor, five identical or very similar subunits form the channel. Cl- channels from the ClC family are dimers C), with an intracellular pore in each subunit. Aquaporin water channels (D) are tetramers with an intracellular channel in each subunit