Twinning, MonozygoticGenetic DeterminismCloning, OrganismCloning, MolecularMolecular Sequence DataBase SequenceAmino Acid SequenceSequence Homology, Amino AcidDNA, ComplementaryGenes, BacterialEscherichia coliRestriction MappingSequence AlignmentPlasmidsSequence Analysis, DNASequence Homology, Nucleic AcidRecombinant ProteinsRNA, MessengerDNAGene LibraryChromosome MappingGene ExpressionPolymerase Chain ReactionDNA, BacterialBlotting, SouthernDNA Restriction EnzymesGenesBlotting, NorthernNucleic Acid HybridizationPhylogenyDNA PrimersDNA, Recombinant