Twinning, MonozygoticGenetic DeterminismCloning, OrganismCloning, MolecularMammalsMolecular Sequence DataAmino Acid SequenceBase SequenceClone CellsDNA, ComplementarySequence Homology, Amino AcidSequence AlignmentSequence Analysis, DNASequence Homology, Nucleic AcidDNARNA, MessengerEscherichia coliGenes, BacterialPhylogenyRestriction MappingChromosome MappingPolymerase Chain ReactionPlasmidsRecombinant ProteinsBlotting, NorthernGene LibraryGene ExpressionBlotting, SouthernSpecies SpecificityGenesNucleic Acid HybridizationDNA, BacterialDNA PrimersCell LineDNA Restriction EnzymesOpen Reading FramesMutationTranscription, GeneticGenomic LibraryMultigene FamilyTissue DistributionDNA, RecombinantGenetic VectorsGenetic Complementation TestTransfectionOrgan SpecificityCosmidsBacterial ProteinsGene Expression RegulationMolecular WeightCarrier ProteinsEvolution, MolecularBiological EvolutionPhenotypeConserved Sequence