Ion TransportHeart Conduction SystemIon Channel GatingNeural ConductionIon ChannelsPotassium ChannelsPotassiumElectric ConductivityWolff-Parkinson-White SyndromeMembrane PotentialsIonsOocytesBiological Transport, ActiveSinoatrial NodeBiological TransportElectrophysiologyLipid BilayersXenopus laevisShaker Superfamily of Potassium ChannelsModels, MolecularHeart AtriaAmino Acid SequenceKv1.2 Potassium ChannelKineticsMutagenesis, Site-DirectedSodiumChloridesAtrioventricular NodeModels, BiologicalBatrachotoxinsSodium ChannelsMolecular Sequence DataProtein ConformationBiophysical PhenomenaBiophysicsAxonal TransportSodium-Potassium-Exchanging ATPaseMembrane Transport ProteinsPotassium Channel BlockersProtein Structure, TertiaryHeart BlockAmilorideProtein TransportPatch-Clamp TechniquesBumetanideTetraethylammoniumMutationHydrogen-Ion ConcentrationBinding SitesCell MembraneAction PotentialsComputer SimulationIon PumpsSodium-Potassium-Chloride SymportersCalciumOuabainHeavy IonsProtein Structure, SecondaryElectrocardiographyAnionsBone ConductionCarrier ProteinsCell Membrane PermeabilityMedian NerveDogsTime FactorsEpitheliumCationsRabbitsIon ExchangeMonosaccharide Transport ProteinsCardiac Pacing, ArtificialCation Transport ProteinsAxonsArrhythmias, CardiacBicarbonatesRubidiumIntestinal MucosaElectrolytesRefractory Period, ElectrophysiologicalElectron TransportProtonsChloride ChannelsColonUlnar NerveMalpighian TubulesWaterAdenosine TriphosphateCystic Fibrosis Transmembrane Conductance RegulatorPeripheral NervesMembrane ProteinsElectrophysiologic Techniques, CardiacWater-Electrolyte BalanceGramicidinElectric StimulationCells, CulturedMagnesiumAnion Transport ProteinsEpithelial Sodium ChannelsEpithelial Cells