Embryonic DevelopmentGene Expression Regulation, DevelopmentalEmbryonic StructuresEmbryo, MammalianEmbryo, NonmammalianBody PatterningZebrafishIn Situ HybridizationMesodermEmbryonic and Fetal DevelopmentBlastocystEmbryo LossZygoteOocytesFertilizationPregnancyGene TargetingOogenesisMolecular Sequence DataEmbryo Culture TechniquesEmbryologyGastrulaGastrulationZebrafish ProteinsFertilization in VitroGerm LayersEmbryonic Stem CellsCell DifferentiationBlastulaMorulaMice, KnockoutMorphogenesisHomeodomain ProteinsXenopus ProteinsTranscription FactorsOvumBlastomeresBase SequenceRNA, MessengerGenes, LethalXenopus laevisAmino Acid SequenceEmbryo ImplantationCleavage Stage, OvumEndodermChick EmbryoPhenotypeMutationSignal TransductionSpermatozoaDrosophila ProteinsDNA-Binding ProteinsParthenogenesisMeiosisReverse Transcriptase Polymerase Chain ReactionMice, Inbred C57BLNervous SystemOctamer Transcription Factor-3Sequence Homology, Amino AcidCattleDNA, ComplementaryDrosophilaStem CellsTime FactorsMice, Mutant StrainsHeterozygoteFallopian TubesFetal DeathEctodermMice, TransgenicOviductsFertilityCells, CulturedMice, Inbred ICRXenopusOvaryCloning, MolecularCell LineageGene Expression ProfilingGene ExpressionTranscription, GeneticImmunohistochemistryHomozygoteDrosophila melanogasterNuclear ProteinsSperm-Ovum InteractionsDNA PrimersCell NucleusBone Morphogenetic ProteinsTissue DistributionMicroinjectionsApoptosisGerm CellsMosaicismPlacentaGene DeletionGestational AgeRepressor ProteinsCell DivisionProteins