Twinning, MonozygoticGenetic DeterminismCloning, OrganismCloning, MolecularClone CellsMolecular Sequence DataBase SequenceAmino Acid SequenceDNA, ComplementarySequence Homology, Amino AcidDNASequence Homology, Nucleic AcidSequence Analysis, DNASequence AlignmentRNA, MessengerEscherichia coliGenes, BacterialPolymerase Chain ReactionPlasmidsChromosome MappingBlotting, SouthernBlotting, NorthernNucleic Acid HybridizationGenesRestriction MappingRecombinant ProteinsGene ExpressionDNA, Bacterial