EndodermXenopusXenopus laevisXenopus ProteinsPhenotypeSOXF Transcription FactorsGene Expression Regulation, DevelopmentalEmbryo, NonmammalianMesodermGastrulaEmbryonic InductionMolecular Sequence DataBody PatterningEctodermIn Situ HybridizationCell DifferentiationGerm LayersHomeodomain ProteinsNodal ProteinTranscription FactorsAmino Acid SequenceBase SequenceMorphogenesisMutationVisceraGATA6 Transcription FactorGATA5 Transcription FactorDigestive SystemHepatocyte Nuclear Factor 3-betaSOX Transcription FactorsActivinsZebrafish ProteinsSignal TransductionRNA, MessengerEmbryonic Stem CellsCell LineageYolk SacBlastulaZebrafishT-Box Domain ProteinsDNA-Binding ProteinsCloning, MolecularMicroinjectionsEmbryo, MammalianNotochord