Transcription Factor TFIIIARNA, Ribosomal, 5SDNA-Directed RNA PolymerasesTranscription FactorsXenopus laevisTranscription, GeneticRNA, RibosomalBase SequenceMolecular Sequence DataDNA-Binding ProteinsPromoter Regions, GeneticGene Expression RegulationSp1 Transcription FactorRNA Polymerase IIBinding SitesProtein BindingDNAPolymerase Chain ReactionRNA, MessengerAmino Acid SequenceZinc FingersTrans-ActivatorsTranscriptional ActivationNuclear ProteinsBasic Helix-Loop-Helix Transcription FactorsCell LineMutationDNA-Directed DNA PolymeraseTranscription Factor AP-1RNA Polymerase IIIRepressor ProteinsForkhead Transcription FactorsHomeodomain ProteinsGene Expression Regulation, DevelopmentalSignal TransductionCell NucleusHeLa CellsBasic-Leucine Zipper Transcription FactorsTranscription Factors, TFIICloning, MolecularReverse Transcriptase Polymerase Chain ReactionTranscription Factor AP-2TransfectionPlasmidsCell DifferentiationXenopusChromatin ImmunoprecipitationTranscription Factor TFIIAKruppel-Like Transcription Factors