Cell DifferentiationCell LineageMyocytes, CardiacCells, CulturedHeartMyocardiumCardiomegalySignal TransductionCardiac OutputMyocardial ContractionAnimals, NewbornEmbryonic Stem CellsStem CellsArrhythmias, CardiacHeart VentriclesGene Expression Regulation, DevelopmentalRNA, MessengerTranscription FactorsGene Expression RegulationCell LineRats, Sprague-DawleyTime FactorsMice, TransgenicCardiac Surgical ProceduresMice, Inbred C57BLDeath, Sudden, CardiacMice, KnockoutCell ProliferationCalciumMyoblasts, CardiacReverse Transcriptase Polymerase Chain ReactionRats, WistarGene ExpressionApoptosisSex DifferentiationCell DivisionImmunohistochemistryHeart DiseasesMolecular Sequence DataCardiac MyosinsCardiomyopathiesPhenotypeHeart FailureBlotting, WesternCardiotonic AgentsDNA-Binding ProteinsGATA4 Transcription FactorBase SequenceTretinoinMitochondria, HeartHomeodomain ProteinsCell Culture TechniquesCardiac Pacing, ArtificialVentricular RemodelingMuscle ProteinsSarcomeresPhosphorylationMyocardial InfarctionCell SizeTransfectionCell SurvivalMuscle CellsEmbryo, MammalianMesenchymal Stromal CellsUp-RegulationMyocardial Reperfusion InjuryCardiac TamponadeDisease Models, AnimalIsoproterenolMyocardial IschemiaTranscription, GeneticBiological MarkersRegenerationModels, BiologicalAntigens, DifferentiationGene Expression ProfilingCardiomyopathy, DilatedTroponin ICardiac CatheterizationCalcium Channels, L-TypePromoter Regions, GeneticMuscle DevelopmentOsteogenesisMutationIn Situ HybridizationEnzyme ActivationOsteoblastsHypertrophyDown-RegulationConnexin 43Dose-Response Relationship, DrugCalcium SignalingMyoblastsFibroblastsEchocardiographyFlow CytometryBone Marrow CellsTrans-ActivatorsChick EmbryoHeart Arrest