GastrulationBlastulaGerm LayersGastrulaEmbryo, NonmammalianMesodermEndodermEctodermGene Expression Regulation, DevelopmentalXenopus ProteinsBody PatterningZebrafishSea UrchinsEmbryonic InductionZebrafish ProteinsMorphogenesisXenopus laevisIn Situ HybridizationXenopusNodal ProteinNodal Signaling LigandsBlastocystOrganizers, EmbryonicGoosecoid ProteinCell DifferentiationFetal ProteinsEmbryonic DevelopmentBlastomeresT-Box Domain ProteinsNotochordBlastodermNeoplasms, Germ Cell and EmbryonalEmbryonic Stem CellsActivinsHomeodomain ProteinsNervous SystemBone Morphogenetic ProteinsMolecular Sequence DataPleurodelesSignal TransductionCell LineageWnt ProteinsTranscription FactorsTeratomaZygotePrimitive StreakOctamer Transcription Factor-3Cell MovementSOXF Transcription FactorsEmbryo, MammalianAmino Acid SequencePluripotent Stem CellsBase SequenceFibroblast Growth FactorsRNA, MessengerEmbryonic and Fetal DevelopmentEmbryoid BodiesBone Morphogenetic Protein 4Strongylocentrotus purpuratusOvumChick EmbryoWheat Germ AgglutininsSOXB1 Transcription FactorsGenes, HomeoboxInduced Pluripotent Stem CellsDrosophilaModels, BiologicalSequence Homology, Amino AcidTransforming Growth Factor betaMicroinjectionsPhenotypeDNA-Binding ProteinsNeural PlateStem CellsDrosophila ProteinsOtx Transcription FactorsMutationTranscription Factor 3ImmunohistochemistryCloning, MolecularIntercellular Signaling Peptides and ProteinsCell PolarityGerm CellsUrochordataTime FactorsReverse Transcriptase Polymerase Chain ReactionCell AdhesionGene ExpressionInhibinsAnimals, Genetically ModifiedProteinsHemicentrotusTestisChimeraOogenesisCell Culture TechniquesSpermatogenesisMicroscopy, Electron, ScanningHeadbeta Catenin