Organizers, EmbryonicGoosecoid ProteinNodal Signaling LigandsBody PatterningZebrafish ProteinsZebrafishNucleolus Organizer RegionGene Expression Regulation, DevelopmentalXenopus ProteinsHomeodomain ProteinsEmbryo, NonmammalianXenopusVertebratesIn Situ HybridizationEmbryo, MammalianMesodermIntercellular Signaling Peptides and ProteinsWnt ProteinsReptilesChick EmbryoViviparity, NonmammalianOryziasChickensMolecular Sequence DataGastrulaMammalsOncorhynchus mykissEmbryonic InductionAmino Acid SequenceSaccule and UtricleFish ProteinsSignal TransductionEmbryo ImplantationEvolution, MolecularFishesBlastocystPhylogenySequence Homology, Amino AcidEmbryonic DevelopmentSilver StainingHair Cells, AuditoryEmbryologyRana catesbeianaBase SequenceCloning, MolecularOptic Lobe, NonmammalianSequence AlignmentOtx Transcription FactorsDNA, ComplementarySpecies SpecificityRNA, MessengerEctodermBlastomeresMorphogenesisNotochordEmbryonic and Fetal DevelopmentNodal ProteinFibroblast Growth Factor 8Tissue DistributionRhombencephalonEmbryo LossXenopus laevisNervous SystemBone Morphogenetic ProteinsFertilization in VitroRetinaHeadCleavage Stage, OvumEndodermTranscription FactorsMesencephalonZygoteHydraAxisPregnancySequence Analysis, DNATissue TransplantationGenes, HomeoboxBlastodermLIM-Homeodomain ProteinsEmbryo DispositionCell NucleolusWnt1 ProteinCulture TechniquesMorulaSilverActivinsLeft-Right Determination FactorsT-Box Domain ProteinsOocytes