Myocytes, CardiacGene Expression ProfilingGene ExpressionGene Expression RegulationRNA, MessengerOligonucleotide Array Sequence AnalysisMyocardiumCells, CulturedGene Expression Regulation, DevelopmentalMolecular Sequence DataBase SequenceReverse Transcriptase Polymerase Chain ReactionMutationTranscription FactorsTranscription, GeneticPromoter Regions, GeneticSignal TransductionHeartAnimals, NewbornPhenotypeCardiomegalyGene Expression Regulation, EnzymologicGene Expression Regulation, NeoplasticCell LineRats, Sprague-DawleyCell DifferentiationGene Expression Regulation, PlantDNA-Binding ProteinsMice, Inbred C57BLMyocardial ContractionMice, TransgenicRats, WistarGene Expression Regulation, BacterialTransfectionAmino Acid SequenceMice, KnockoutApoptosisTime FactorsHeart VentriclesDNA PrimersGene Expression Regulation, ViralBlotting, WesternGenes, ReporterUp-RegulationNuclear ProteinsCalciumDisease Models, AnimalEmbryonic Stem CellsPolymerase Chain ReactionGene Expression Regulation, FungalImmunohistochemistryCluster AnalysisDown-RegulationTranscriptomeBlotting, NorthernIn Situ HybridizationRepressor ProteinsHomeodomain ProteinsRNADNA, ComplementaryMitochondria, HeartTrans-ActivatorsPhosphorylationGATA4 Transcription FactorModels, BiologicalMutation, MissenseTranscriptional ActivationFibroblastsMicroarray AnalysisProtein BindingGene DeletionCell SizeMuscle ProteinsDNACell NucleusPedigreeCell SurvivalGenetic VectorsGreen Fluorescent ProteinsCardiotonic AgentsSarcomeresMyocardial Reperfusion InjuryModels, GeneticMembrane ProteinsExonsCloning, MolecularOrgan SpecificityCell ProliferationCarrier ProteinsEmbryo, MammalianStem CellsHypertrophyRNA InterferenceGene TargetingCalcium Channels, L-TypeIsoproterenolReal-Time Polymerase Chain ReactionCell Line, TumorDose-Response Relationship, DrugMuscle Cells