Twinning, MonozygoticGenetic DeterminismCloning, OrganismCloning, MolecularMolecular Sequence DataAmino Acid SequenceBase SequenceDNA, ComplementarySequence Homology, Amino AcidSequence AlignmentRestriction MappingGenes, BacterialEscherichia coliGene LibrarySequence Homology, Nucleic AcidSequence Analysis, DNADNARNA, MessengerPlasmidsRecombinant ProteinsBlotting, NorthernChromosome MappingGene ExpressionBlotting, SouthernPolymerase Chain ReactionDNA, BacterialGenesDNA PrimersOpen Reading FramesDNA Restriction EnzymesNucleic Acid HybridizationPhylogeny