4-Nitroquinoline-1-oxideNitroquinolinesMethylene BlueTongue Neoplasms4-Hydroxyaminoquinoline-1-oxideCarcinogensMethylene ChlorideNitro CompoundsTongueHesperidinMutagensNitric Oxide SynthasePronaseAminoquinolinesMouth NeoplasmsQuinolinesPapillomaAnticarcinogenic AgentsPolyaminesCarcinoma, Squamous CellPrecancerous ConditionsDNA RepairRats, Inbred F344Nitric Oxide Synthase Type IIDNAFibroblastsOxidesDNA DamageUltraviolet RaysGlutathione TransferaseNitric Oxide Synthase Type IIICell Transformation, NeoplasticNitric Oxide Synthase Type IPyridinesNitrogen OxidesCells, CulturedArginineZinc OxideNG-Nitroarginine Methyl EsterLiver