Wang R, Su J, Zhang X, Shi Y, Cui N, Onyebuchi VA, Jiang C. Kir6.2 Channel Gating by Intracellular Protons: Subunit Stoichiometry for Ligand Binding and Channel Gating. The Journal of Membrane Biology. 2006 Sep;213(3):155–64. doi: 10.1007/s00232-006-0038-x.