Mice, KnockoutPhenotypeIntegrasesGene TargetingMice, TransgenicTetracyclineDoxycyclineGene Knockout TechniquesGene DeletionGenetic EngineeringRecombination, GeneticGene Knock-In TechniquesGenetic TechniquesTransgenesGenes, ReporterMice, Inbred C57BLGene SilencingGreen Fluorescent ProteinsGene Expression Regulation, DevelopmentalGenetic VectorsEmbryo, MammalianLac OperonGene Expression RegulationGene Expressionbeta-GalactosidaseViral ProteinsPromoter Regions, GeneticOrgan SpecificityCell DifferentiationTamoxifenMutagenesis, InsertionalStem CellsAllelesCell LineageMutationSignal TransductionTranscription FactorsPlasmidsTranscriptional ActivationCells, CulturedTrans-ActivatorsBase SequenceCell ProliferationCell LineCell SurvivalRecombinant Fusion ProteinsDNA-Binding ProteinsTranscription, Genetic