Epithelial CellsCell CycleCell ProliferationCell DivisionCell AgingEpitheliumCell Cycle ProteinsCells, CulturedSignal TransductionApoptosisCell LineIntestinal MucosaCell Line, TumorBromodeoxyuridineCell DifferentiationRNA, MessengerImmunohistochemistryCell Cycle CheckpointsProliferating Cell Nuclear AntigenBlotting, WesternColonGene Expression RegulationCyclin-Dependent Kinase Inhibitor p21PhosphorylationMitosisMammary Glands, AnimalReverse Transcriptase Polymerase Chain ReactionFibroblastsMice, Inbred C57BLCell SurvivalEpithelium, CornealKi-67 AntigenCyclin D1G1 PhaseTime FactorsCyclinsCell Transformation, NeoplasticTumor Suppressor Protein p53Tumor Cells, CulturedRNA, Small InterferingGene ExpressionMice, KnockoutTranscription FactorsDown-RegulationCell MovementLens, CrystallineMice, TransgenicGastric MucosaUp-RegulationDNA-Binding ProteinsRespiratory MucosaTransfectionS PhaseProtein-Serine-Threonine KinasesMolecular Sequence DataGene Expression Regulation, NeoplasticDose-Response Relationship, DrugRetinoblastoma ProteinCyclin-Dependent Kinase Inhibitor p27Flow CytometryMethylhydrazinesFibroblast Growth Factor 7Models, BiologicalMutationWound HealingNuclear ProteinsDNACell Growth ProcessesBase SequenceThymidineCyclin-Dependent Kinase Inhibitor p16PhenotypeProstateMammary Glands, HumanTranscription, GeneticEpidermal Growth FactorTransforming Growth Factor betaHyperplasiaOrgan Culture TechniquesEnzyme InhibitorsTumor Suppressor ProteinsProto-Oncogene Proteins c-mycEnzyme ActivationGene Expression ProfilingRNA InterferenceGene Expression Regulation, DevelopmentalMitotic IndexProto-Oncogene ProteinsDNA ReplicationCell CountBronchiProto-Oncogene Proteins c-aktDisease Models, AnimalDNA DamageMorphogenesisLungColonic NeoplasmsIntestine, SmallRats, Sprague-DawleyBreast Neoplasms