Heart Conduction SystemHeart AtriaAtrioventricular NodeHeartNeural ConductionBundle of HisHeart BlockPurkinje FibersSinoatrial NodeHeart RateConnexinsElectrocardiographyArrhythmias, CardiacAtrioventricular BlockHeart VentriclesMyocardiumT-Box Domain ProteinsHeterotaxy SyndromeVentricular FunctionAtrial FunctionHeart DiseasesCardiac Pacing, ArtificialWolff-Parkinson-White SyndromeHeart Defects, CongenitalMyocytes, CardiacAction PotentialsRefractory Period, ElectrophysiologicalSp4 Transcription FactorHeart FailureConnexin 43ElectrophysiologyCardiac ElectrophysiologyMyocardial ContractionAcetylthiocholineGene Expression Regulation, DevelopmentalModels, CardiovascularDogsGATA6 Transcription FactorHeart SeptumAnti-Arrhythmia AgentsDextrocardiaAtrial FibrillationThiolester HydrolasesNAV1.5 Voltage-Gated Sodium ChannelTachycardiaBundle-Branch BlockElectrophysiologic Techniques, CardiacLac OperonTachycardia, Atrioventricular Nodal ReentryHeart TransplantationCnidariaCardiomyopathiesAntigens, CD57Situs InversusLamin Type AElectrophysiological ProcessesPericardiumFetal HeartUbiquitin ThiolesteraseCatheter AblationAporphinesPacemaker, ArtificialCardiomyopathy, DilatedVectorcardiographyDeath, Sudden, CardiacSodium ChannelsBone ConductionTime FactorsTelemetryBradycardiaAtrial Function, RightMice, TransgenicChick EmbryoAtrial FlutterRabbitsMedian NervePulmonary VeinsHomeodomain ProteinsHeart ValvesDesminHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsElectric StimulationUlnar NerveCell LineageBiological ClocksBody Surface Potential MappingOrganogenesisPeripheral NervesNeurofilament ProteinsImmunohistochemistryHeart NeoplasmsTranscription FactorsDisease Models, AnimalImage Processing, Computer-AssistedEndocardiumGuinea PigsTibial NerveMice, KnockoutPhenotypeGenetic Diseases, X-Linked