VertebratesGene Expression Regulation, DevelopmentalCell DifferentiationEmbryo, NonmammalianZebrafishEmbryonic DevelopmentBody PatterningZebrafish ProteinsXenopus ProteinsGastrulaIn Situ HybridizationMesodermNodal ProteinMolecular Sequence DataXenopus laevisSignal TransductionTranscription FactorsXenopusHomeodomain ProteinsMorphogenesisHagfishesAmino Acid SequenceSomitesGastrulationWnt ProteinsBase SequenceBone Morphogenetic ProteinsNervous SystemLampreysChick EmbryoEvolution, MolecularGene DuplicationBlastulaRNA, MessengerSharksPhylogenyOpsinsCells, CulturedSequence Homology, Amino AcidOryziasEndodermSequence AlignmentFishesStem CellsDNA-Binding ProteinsCell LineBiological EvolutionTransforming Growth Factor betaEmbryo, MammalianGene Expression RegulationMultigene FamilyCell LineageGenomeCloning, MolecularEctodermCell DivisionTretinoinEmbryonic and Fetal DevelopmentAnimals, Genetically ModifiedPhenotypeNeural CrestEmbryonic Stem CellsTranscription, GeneticConserved SequencePlant Somatic Embryogenesis TechniquesGene ExpressionMutationDrosophila ProteinsRepressor ProteinsCell ProliferationImmunohistochemistrySpecies SpecificityModels, BiologicalTrans-ActivatorsReverse Transcriptase Polymerase Chain ReactionDrosophilaModels, GeneticNuclear ProteinsPromoter Regions, GeneticGene Expression ProfilingDNA, ComplementaryDNA PrimersFibroblast Growth FactorsSex DifferentiationMice, TransgenicGenes, HomeoboxMice, KnockoutMice, Inbred C57BLTime FactorsBasic Helix-Loop-Helix Transcription FactorsCell CycleNeuronsDrosophila melanogasterMuscle DevelopmentTumor Cells, CulturedReceptors, NotchTransfectionHL-60 CellsNerve Tissue ProteinsMembrane Proteins