Cloning, OrganismSwineNuclear Transfer TechniquesSus scrofaEmbryo, MammalianBlastocystMorulaGuinea PigsEmbryonic and Fetal DevelopmentEmbryo, NonmammalianFertilization in VitroChick EmbryoPregnancyCytopathogenic Effect, ViralOocytesEmbryo TransferEmbryo ImplantationCloning, MolecularEmbryonic DevelopmentCells, CulturedMolecular Sequence DataBase SequenceAmino Acid SequenceGene Expression Regulation, DevelopmentalEmbryo LossCleavage Stage, OvumBlastomeresEmbryo DispositionZygoteZebrafishSequence Homology, Amino AcidIn Situ Hybridization