Enhancer Elements, GeneticPromoter Regions, GeneticBase SequenceMolecular Sequence DataTranscription FactorsTranscription, GeneticDNA-Binding ProteinsGene Expression RegulationBinding SitesRegulatory Sequences, Nucleic AcidHIV EnhancerNuclear ProteinsGene Expression Regulation, DevelopmentalCell LineDeoxyribonuclease IGenes, RegulatorChloramphenicol O-AcetyltransferaseTransfectionGenes, ReporterIntronsMEF2 Transcription FactorsMyogenic Regulatory FactorsHomeodomain ProteinsPlasmidsDNAMice, TransgenicTranscriptional ActivationDrosophila ProteinsTrans-ActivatorsRepetitive Sequences, Nucleic AcidRepressor Proteins