AmphibiansOocytesTriturusBufo arenarumOvumPleurodelesXenopusXenopus laevisNotophthalmus viridescensSalamandridaeUrodelaOogenesisRana pipiensChytridiomycotaCell NucleusMeiosisCell NucleolusEgg ProteinsMicroinjectionsAmphibian ProteinsCytoplasmRanidaeChromosomesAnuraNucleoproteinsProgesteroneBufonidaeOocyte DonationOocyte RetrievalMolecular Sequence DataRNAProtein BiosynthesisAmbystomaRanavirusAmbystoma mexicanumIn Vitro Oocyte Maturation TechniquesTranscription, GeneticReptilesAmphibian VenomsMetamorphosis, BiologicalMolecular WeightFertilizationMetaphaseBlastocystXenopus ProteinsCumulus CellsLarvaSperm-Ovum InteractionsBufo marinusParthenogenesisOvaryEmbryonic DevelopmentRana catesbeianaMycosesEmbryo, NonmammalianCryopreservationSperm Injections, IntracytoplasmicPondsEmbryo TransferAnimal DiseasesCleavage Stage, OvumMaturation-Promoting FactorAmino Acid SequenceSpermatozoaZygoteZona PellucidaEndangered SpeciesDNA Virus InfectionsRNA, MessengerGastrulaRana esculentaBase SequenceNuclear Transfer TechniquesEmbryo Culture TechniquesGene Expression Regulation, DevelopmentalMammalsSpecies SpecificityRana temporariaRNA, ComplementaryVertebratesPregnancySaprolegniaRana ridibundaFishesEmbryonic and Fetal DevelopmentExtinction, BiologicalDermatomycosesFollicular FluidPhylogenyOvulation InductionTime FactorsCells, CulturedCloning, MolecularExtremitiesEmbryo, MammalianRegenerationAtrazineBiodiversityProto-Oncogene Proteins c-mosCryoprotective Agents