Yolk SacChickensChick EmbryoEgg YolkEmbryo, MammalianEmbryo, NonmammalianEmbryo ImplantationEmbryonic DevelopmentBlastocystGene Expression Regulation, DevelopmentalEndodermal Sinus TumorEmbryonic and Fetal DevelopmentVitelline MembraneEmbryo LossPregnancyAvian Sarcoma VirusesAvian ProteinsEndodermCulture TechniquesMolecular Sequence DataMesonephromaIn Situ HybridizationBase SequenceFertilization in VitroCleavage Stage, OvumBlastomeresPoultry DiseasesMesodermMorphogenesisGastrulaEndolymphatic SacAir SacsAvian leukosis virusZebrafishAmino Acid SequenceRNA, MessengerFibroblastsExtraembryonic MembranesBursa of FabriciusCell DifferentiationBody PatterningEmbryo DispositionAllantoisAlpharetrovirusZygoteMorulaQuailTranscription FactorsCryopreservationEctodermGestational SacAnal SacsOocytesTime FactorsHematopoiesis, ExtramedullaryChimeraCloning, MolecularAvian LeukosisCells, CulturedCell Transformation, ViralGestational AgePlacentaChorioallantoic MembraneOncogene Protein pp60(v-src)Zebrafish ProteinsMutationChorionEgg ProteinsCoturnixEmbryonic InductionEmbryo ResearchHomeodomain ProteinsGene ExpressionSingle Embryo TransferMicroscopy, ElectronCloning, OrganismSomitesImmunohistochemistryFluorescent Antibody TechniqueDNA, ComplementaryEctogenesisalpha-FetoproteinsDNA-Binding ProteinsTranscription, GeneticTeratogensPhenotypeBlood VesselsCulture MediaCell LineGonadsNuclear Transfer TechniquesNervous SystemBlastodermNeural CrestDNASpecies SpecificityCell Transformation, NeoplasticPinocytosisPregnancy RateSequence Homology, Amino Acid