Endocardial CushionsEndocardial Cushion DefectsHeart ValvesEndocardiumHeart SeptumMesodermTransforming Growth Factor beta2HeartHeart Septal DefectsAtrial SeptumChick EmbryoFetal HeartHeart Defects, CongenitalEmbryologyGene Expression Regulation, DevelopmentalTransforming Growth Factor beta3VersicansMorphogenesisT-Box Domain ProteinsGATA4 Transcription FactorIn Situ HybridizationBone Morphogenetic ProteinsNeural CrestMyocardiumTwist Transcription FactorOrganogenesisHeart Septal Defects, VentricularEmbryonic and Fetal DevelopmentEmbryo, MammalianPericardiumTransforming Growth Factor betaWheelchairsEndotheliumCell DifferentiationCell MovementCaryophyllaceaeMice, KnockoutExtracellular Matrix ProteinsExtracellular MatrixEpitheliumHeart VentriclesMice, TransgenicImmunohistochemistryTranscription FactorsCell ProliferationDNA PrimersMicroclimatePressure UlcerSignal TransductionBase SequenceTime FactorsMice, Inbred C57BLReverse Transcriptase Polymerase Chain ReactionOrthopedic EquipmentTruncus Arteriosus, Persistent