Urinary BladderUrotheliumEpitheliumTurbinatesCarcinoma, Transitional CellUrinary Bladder NeoplasmsRats, Inbred F344ImmunohistochemistryEpithelium, CornealSeminiferous EpitheliumEpithelial CellsRetinal Pigment EpitheliumOlfactory MucosaRespiratory MucosaIntestinal MucosaTracheaCorneaBronchiCiliary BodyIn Situ HybridizationMicroscopy, ElectronConjunctivaNasal MucosaRNA, MessengerMetaplasiaCell DifferentiationKeratinsCells, CulturedMicroscopy, Electron, ScanningMorphogenesisOrgan Culture TechniquesMucous MembraneColonMouth MucosaGene Expression Regulation, DevelopmentalEsophagusReverse Transcriptase Polymerase Chain ReactionMice, TransgenicLung