AmphibiansPleurodelesEmbryo, NonmammalianAmbystomaBufo arenarumAmbystoma mexicanumBufonidaeGastrulaEmbryonic InductionXenopus laevisXenopusUrodelaSalamandridaeEctodermAnuraEmbryo, MammalianMesodermBlastomeresNervous SystemOrganizers, EmbryonicXenopus ProteinsMorphogenesisChytridiomycotaChick EmbryoBody PatterningGene Expression Regulation, DevelopmentalAmphibian ProteinsEmbryo ImplantationRanidaeMicroscopy, Electron, ScanningMammalsBlastocystEmbryonic DevelopmentMolecular Sequence DataTime FactorsAmino Acid SequenceCell DifferentiationEmbryonic and Fetal DevelopmentRanavirusReptilesEmbryo LossBase SequenceOocytesCleavage Stage, OvumMetamorphosis, BiologicalTriturusAmphibian VenomsLarvaFertilization in VitroPregnancyIn Situ HybridizationZebrafishSequence Homology, Amino AcidZygoteRana pipiensCloning, MolecularSpecies SpecificityRNA, MessengerOvumRana catesbeianaBufo marinusMycosesTranscription FactorsCell LineEmbryo DispositionPhylogenyMorulaCulture TechniquesPondsAnimal DiseasesZebrafish ProteinsMutationNotophthalmus viridescensDNA, ComplementarySignal TransductionModels, BiologicalCryopreservationExtremitiesSequence AlignmentHomeodomain ProteinsEndangered SpeciesCell NucleusDNAVertebratesNuclear Transfer TechniquesCloning, OrganismFertilizationEndodermFishesGene ExpressionCattleAnimals, Genetically ModifiedDNA-Binding ProteinsTranscription, GeneticDrosophila ProteinsDNA Virus InfectionsRana esculentaEmbryo ResearchDrosophilaSingle Embryo Transfer