<p><b>Copyright information:</b></p><p>Taken from "Ion channel diversity, channel expression and function in the choroid plexuses"</p><p>http://www.cerebrospinalfluidresearch.com/content/4/1/8</p><p>Cerebrospinal Fluid Research 2007;4():8-8.</p><p>Published online 20 Sep 2007</p><p>PMCID:PMC2072944.</p><p></p>s, B) 6TMD-1P voltage-gated Kchannels and C) 4TMD-2P twin pore domain Kchannels. Functional channels are a tetramer of α-subunits (or dimer in the case of the 4TMD-2P), arranged so the extracellular P loops form the pore region of the channel. The charged TMD S4 in the 6TMD-1P structure is thought to be involved in the voltage-gating of these channels. Channel gating may also be modified by the presence of auxiliary β-subunits
