4-Nitroquinoline-1-oxideNitroquinolinesTongue Neoplasms4-Hydroxyaminoquinoline-1-oxideCarcinogensNitro CompoundsTongueHesperidinMutagensNitric Oxide SynthasePronaseAminoquinolinesMouth NeoplasmsQuinolinesAdministration, OralPapillomaAnticarcinogenic AgentsPolyaminesCarcinoma, Squamous CellRats, Inbred F344Nitric Oxide Synthase Type IIPrecancerous ConditionsDNA RepairDNAFibroblastsOxidesGlutathione TransferaseDNA DamageUltraviolet RaysNitric Oxide Synthase Type IIILiverCell Transformation, NeoplasticPyridinesNitric Oxide Synthase Type ICells, CulturedDose-Response Relationship, DrugRats, Sprague-DawleyDrug Administration ScheduleNitrogen OxidesInjections, IntravenousZinc OxideTime FactorsRats, WistarUnited States Food and Drug AdministrationCentrifugation, Density Gradient