Cell DifferentiationMyocytes, CardiacCells, CulturedEmbryonic Stem CellsGene Expression Regulation, DevelopmentalStem CellsSignal TransductionTranscription FactorsEmbryo, MammalianCell LineageCell LineEmbryo, NonmammalianMyocardiumRNA, MessengerGene Expression RegulationCell DivisionMolecular Sequence DataMice, Inbred C57BLMice, TransgenicCell ProliferationTretinoinMice, KnockoutDNA-Binding ProteinsReverse Transcriptase Polymerase Chain ReactionAnimals, NewbornBase SequenceHeartHomeodomain ProteinsGene ExpressionImmunohistochemistryPhenotypeApoptosisTime FactorsChick EmbryoTranscription, GeneticEmbryonic DevelopmentCell Culture TechniquesIn Situ HybridizationCell CycleBlotting, WesternSex DifferentiationTransfectionMorphogenesisGene Expression ProfilingModels, BiologicalCell SurvivalNuclear ProteinsPromoter Regions, GeneticPluripotent Stem CellsMesodermTrans-ActivatorsRats, Sprague-DawleyRepressor ProteinsAmino Acid SequenceCarcinoma, EmbryonalUp-RegulationEndodermCardiomegalyBlastocystMutationPhosphorylationFlow CytometryDown-RegulationMesenchymal Stromal CellsCell AggregationCell NucleusDNA PrimersMyocardial ContractionTumor Cells, CulturedTeratomaBasic Helix-Loop-Helix Transcription FactorsZebrafishCalciumFluorescent Antibody TechniqueXenopus ProteinsOctamer Transcription Factor-3Rats, WistarOsteogenesisMuscle DevelopmentAntigens, DifferentiationMembrane ProteinsDimethyl SulfoxideHematopoietic Stem CellsNeuronsOsteoblastsBone Morphogenetic ProteinsFibroblastsBone Marrow CellsRNA InterferenceMyoblastsEmbryonal Carcinoma Stem CellsGreen Fluorescent ProteinsEnzyme ActivationHL-60 CellsCell MovementGastrulaCoculture TechniquesB-LymphocytesProto-Oncogene ProteinsLeukemia, Erythroblastic, Acute