Cloning, OrganismSwineNuclear Transfer TechniquesGuinea PigsSus scrofaClone CellsEmbryo, MammalianBlastocystMorulaEmbryonic and Fetal DevelopmentEndogenous RetrovirusesAntibodies, HeterophileOncogenic VirusesEmbryo, NonmammalianGalactosyltransferasesFertilization in VitroChick EmbryoPregnancyCytopathogenic Effect, ViralCloning, MolecularOocytesDisaccharidesCells, CulturedTransplantation, HeterologousMolecular Sequence DataEmbryo TransferPapioEmbryo ImplantationBase SequenceAntigens, CD55Animals, Genetically ModifiedAmino Acid SequenceCell LineEmbryonic DevelopmentVirus ReplicationSpecies Specificity