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Escherichia ColiSecondary StructureRNA PolymeraseGene ExpressionAmino AcidNucleotide SequenceDrosophila MelanogasterProteinsGlobular ProteinsComparative AnalysisNucleic AcidsEscherichia Coli CellsComplex FormationTranscription FactorsRat LivertRNA SynthetaseRibosomal ProteinsSaccharomyces CerevisiaeRegulation of Gene ExpressionHuman Genome