Embryo, MammalianEmbryo, NonmammalianChick EmbryoMyocytes, CardiacEmbryo ImplantationCardiac OutputHeartBlastocystEmbryonic DevelopmentCardiac Surgical ProceduresArrhythmias, CardiacGene Expression Regulation, DevelopmentalDeath, Sudden, CardiacEmbryo LossEmbryonic and Fetal DevelopmentHeart Defects, CongenitalPregnancyFertilization in VitroTime FactorsMyocardiumMutationCleavage Stage, OvumBlastomeresCardiomegalyCardiac TamponadeZebrafishCardiac Pacing, ArtificialHeart DiseasesCardiac CatheterizationMyocardial ContractionMolecular Sequence DataHeart VentriclesHeart Septal Defects, VentricularPhenotypeIn Situ HybridizationBody PatterningHeart ArrestMorphogenesisEmbryo DispositionHeart Septal Defects, AtrialMorulaZygoteRNA, MessengerMyoblasts, CardiacGastrulaCardiomyopathiesMesodermElectrocardiographyHeart FailureTranscription FactorsSignal TransductionCardiac MyosinsZebrafish ProteinsEchocardiographyCryopreservationOocytesBase SequenceMice, KnockoutCardiac Imaging TechniquesMice, Inbred C57BLAmino Acid SequenceHeart RateMice, TransgenicHomeodomain ProteinsCardiac GlycosidesHemodynamicsCell DifferentiationCardiac Output, LowCulture TechniquesMyocardial InfarctionOut-of-Hospital Cardiac ArrestCardiac VolumeEmbryo ResearchHeart Septal DefectsCloning, OrganismAnimals, Genetically ModifiedVentricular RemodelingHeart TransplantationSingle Embryo TransferDisease Models, AnimalTroponin IVentricular Function, LeftFetal HeartTreatment OutcomeDrosophila ProteinsEctogenesisXenopus ProteinsNuclear Transfer TechniquesEctodermGene ExpressionDrosophilaDogsDNA-Binding ProteinsCells, CulturedPregnancy RateStroke VolumeBlood PressureEndodermHeart Conduction SystemCalcium