Gene Expression Regulation, BacterialGene Expression RegulationBase SequenceRNA, MessengerMolecular Sequence DataPromoter Regions, GeneticMutationTranscription, GeneticGene ExpressionBacterial ProteinsGene Expression Regulation, FungalOperonGenes, RegulatorTranscription FactorsGene Expression Regulation, EnzymologicGenes, BacterialDNA-Binding ProteinsPlasmidsLac OperonEscherichia coliCells, CulturedDown-RegulationTrans-ActivatorsCell LineOligonucleotide Array Sequence AnalysisReverse Transcriptase Polymerase Chain ReactionPhenotypeDNA PrimersAmino Acid SequenceSaccharomyces cerevisiaeBlotting, NorthernEscherichia coli ProteinsGene Expression Regulation, PlantGenesGenes, ReporterRestriction MappingGenotypeAllelesSaccharomyces cerevisiae ProteinsGene Expression ProfilingFungal ProteinsCloning, MolecularGene Expression Regulation, DevelopmentalRepressor ProteinsArabidopsisTransfectionGene DeletionSignal TransductionDNA, BacterialRecombinant Fusion ProteinsPolymerase Chain ReactionUp-RegulationBlotting, WesternMembrane ProteinsProtein BiosynthesisMice, KnockoutProtein BindingCell DifferentiationMice, Inbred C57BL