Nasal MucosaNasal CavityTurbinatesOlfactory MucosaNose NeoplasmsNasal SeptumNasal PolypsNitrosaminesDimethylnitrosamineRhinitis, Allergic, PerennialNasal Lavage FluidRats, Inbred F344Intestinal MucosaCarcinogensGastric MucosaFormaldehydeNose DiseasesRhinitisNoseMouth MucosaAdministration, IntranasalNasal Decongestants