Mice, KnockoutPhenotypeEmbryo, MammalianGene Expression Regulation, DevelopmentalOrgan Culture TechniquesGene Knockout TechniquesMice, Inbred C57BLMorphogenesisIn Situ HybridizationTelencephalonMice, Inbred ICREmbryonic and Fetal DevelopmentCell DifferentiationNeuronsCells, CulturedEnamel OrganMice, TransgenicPalateNeural Stem CellsTooth GermRNA, MessengerPregnancyImmunohistochemistryNerve Tissue ProteinsHeartSignal TransductionMesodermBrainProsencephalonMice, Inbred StrainsNeocortexHomeodomain ProteinsStem CellsEnteric Nervous SystemCerebral CortexEpitheliumPaired Box Transcription FactorsOdontogenesisRhombencephalonTrigeminal NerveHedgehog ProteinsMolarMedian EminenceTime FactorsSpinal CordTranscription FactorsCulture TechniquesCytological TechniquesMolecular Sequence DataUreterElectroporationAxonsCarbocyaninesBasic Helix-Loop-Helix Transcription FactorsNeurogenesisBromodeoxyuridineTissue Culture TechniquesToothGestational AgeOrganogenesisFibroblast Growth Factor 10LungOligonucleotides, AntisenseBody PatterningGene ExpressionCell Division