Upstream Stimulatory FactorsCOUP Transcription Factor ICOUP Transcription Factor IICOUP Transcription FactorsTranscription FactorsPromoter Regions, GeneticReceptors, SteroidDNA-Binding ProteinsTranscription, GeneticBase SequenceHepatocyte Nuclear Factor 4Molecular Sequence DataChickensGene Expression RegulationBasic Helix-Loop-Helix Leucine Zipper Transcription FactorsBinding SitesTransfectionRetinoid X ReceptorsE-Box ElementsNuclear ProteinsReceptors, Cytoplasmic and NuclearReceptors, Retinoic AcidCell LineTranscriptional ActivationHelix-Loop-Helix MotifsProtein Binding