BlastulaSea UrchinsGastrulaEmbryo, NonmammalianBlastocystXenopus ProteinsEctodermMesodermXenopusEmbryonic InductionGene Expression Regulation, DevelopmentalBlastomeresNodal Signaling LigandsXenopus laevisOrganizers, EmbryonicZebrafishGoosecoid ProteinStrongylocentrotus purpuratusEndodermZebrafish ProteinsBody PatterningHemicentrotusEchinodermataOvumTranscription Factor 3ActivinsPleurodelesNodal ProteinMorphogenesisT-Box Domain ProteinsZygoteIn Situ HybridizationMolecular Sequence DataMicroinjectionsNotochordEmbryonic DevelopmentBenzoylarginine NitroanilideGerm LayersParacentrotusInhibinsBone Morphogenetic ProteinsGastrulationBlastodermSOXF Transcription FactorsFetal ProteinsBase SequenceNervous SystemHomeodomain ProteinsRNA, MessengerStarfishAmino Acid SequenceTranscription FactorsOtx Transcription FactorsFibroblast Growth FactorsFertilizationCleavage Stage, OvumMorulaRanidaeLarvaBone Morphogenetic Protein 4Cloning, MolecularHMGB ProteinsSequence Homology, Amino AcidCell AggregationSignal Transductionbeta CateninOogenesisTranscription Factor 7-Like 1 ProteinAnuraTransforming Growth Factor betaTranscription, GeneticWnt ProteinsCell DifferentiationDNA, ComplementaryProteinsLithiumDNA-Binding ProteinsCytoskeletal ProteinsCell NucleusTime FactorsOocytesTrans-ActivatorsGenesIntercellular Signaling Peptides and ProteinsRNAMicroscopy, Electron, ScanningCell LineageHistonesGlycoproteinsGenes, HomeoboxCentral Nervous SystemMetalloendopeptidasesGene ExpressionCytoplasm