Picolinic AcidsChromiumChromium CompoundsIron Chelating AgentsMutagenicity TestsCarcinogenicity TestsChromatesRandom AllocationChromium AlloysBody CompositionSwineRats, Inbred F344Neoplasms, ExperimentalNicotinic AcidsBlood GlucoseDose-Response Relationship, DrugMice, Inbred StrainsWeldingPotassium DichromateFood, FortifiedChromium IsotopesCarcinogens, EnvironmentalTanningChromium RadioisotopesElectroplatingWeight GainDiphenylcarbazideSpectrophotometry, AtomicMetals, Heavy