Cleavage Stage, OvumBlastomeresBlastocystEmbryo Culture TechniquesEmbryo TransferEmbryonic DevelopmentVitrificationPreimplantation DiagnosisEmbryo, NonmammalianZygoteFertilization in VitroEmbryo ImplantationCryopreservationPolar BodiesBlastulaUrochordataEmbryo, MammalianOocytesSea UrchinsPregnancyMorulaPregnancy RateFetal ViabilityGastrulaMolecular Sequence DataGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentGerm LayersXenopus laevisOvumAmino Acid SequenceFertilizationEmbryonic InductionXenopus ProteinsDNA CleavageBase SequenceAneuploidySperm Injections, IntracytoplasmicXenopusBody PatterningEctodermOctamer Transcription Factor-3Cell NucleusRNA CleavagePregnancy, MultipleIn Situ HybridizationZebrafishRNA, MessengerOogenesisMesodermZebrafish ProteinsSubstrate SpecificityHydrolysisCytoplasmTime FactorsEndopeptidasesTranscription FactorsMorphogenesisProtein Processing, Post-TranslationalIn Situ Hybridization, FluorescenceBinding SitesTranscription, GeneticDNA-Binding ProteinsSignal TransductionCells, CulturedPeptide FragmentsFurinCaspasesKineticsmRNA Cleavage and Polyadenylation FactorsProtein PrecursorsSerine EndopeptidasesCell DifferentiationNucleic Acid ConformationCaspase 3RNA, CatalyticMutationDNARecombinant ProteinsEscherichia coliCell LineCysteine EndopeptidasesEndoribonucleasesApoptosisPeptide HydrolasesCholesterol Side-Chain Cleavage EnzymeSubtilisinsRetrospective StudiesProteolysisAmyloid Precursor Protein SecretasesProtein Structure, TertiaryElectrophoresis, Polyacrylamide GelCatalysisTrypsinMolecular WeightMutagenesis, Site-DirectedProtein BindingPlasmidsAspartic Acid EndopeptidasesMetalloendopeptidases