Membrane PotentialsIon Channel GatingPatch-Clamp TechniquesElectric ConductivityElectrophysiologyKineticsIon ChannelsStructure-Activity RelationshipPotassium ChannelsCalciumAction PotentialsPotassiumOocytesXenopus laevisSodiumCalcium ChannelsShaker Superfamily of Potassium ChannelsBariumPotassium Channels, Voltage-GatedMolecular StructureElectricityDose-Response Relationship, DrugTime FactorsElectric StimulationMolecular Sequence DataXenopusTetraethylammoniumAmino Acid SequenceTetrodotoxinModels, BiologicalNeuronsModels, MolecularCesiumTetraethylammonium CompoundsCell MembraneStereoisomerismGuinea PigsDecapodiformesPotassium Channel BlockersHydrogen-Ion ConcentrationChloridesSodium Channel BlockersCalcium Channel BlockersElectric CapacitanceCalcium Channels, L-TypeCell LineNucleosidesMicroelectrodesAdenosine TriphosphateRabbitsMathematicsBiophysicsLarge-Conductance Calcium-Activated Potassium ChannelsProtein ConformationCell Membrane PermeabilityElectrochemistryRana pipiensBiophysical PhenomenaRats, Sprague-DawleyMutationElectric Power SuppliesLipid BilayersIon TransportMolecular ConformationProtein Structure, TertiaryEther-A-Go-Go Potassium ChannelsRana catesbeianaHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsProtein BindingChloride ChannelsKv1.2 Potassium ChannelPeptidesFluorescent DyesMusclesHeartCyclic AMPMagnesiumCyclic Nucleotide-Gated Cation ChannelsSomatostatinRana esculentaMyocardiumElectrodesComputers, AnalogAnuraSubstrate SpecificityOctreotideBinding, CompetitiveInhibitory Concentration 50Recombinant ProteinsPurkinje FibersEnzyme InhibitorsMagnetic Resonance SpectroscopySpider VenomsModels, NeurologicalCationsMutagenesis, Site-DirectedRana temporariaThionucleotidesScorpion VenomsPotassium Channels, Calcium-Activated