Keynote Address.- Carcinogens and Anticarcinogens.- Activation and Inactivation of Mutagens and Carcinogens Part I.- The Relation of Activation and Inactivation to Antimutagenic Processes.- Cancer and Free Radicals.- Cytochromes P-450 and the Activation and Inactivation of Mutagens and Carcinogens.- Alteration of Mutagenic Potentials by Peroxidase, Catalase, and Superoxide Dismutase.- Activation and Inactivation of Mutagens and Carcinogens Part II.- Effects of Vitamins C and E on Carcinogen Formation and Action, and Relationship to Human Cancer.- Modifiers of Endogenous Nitrosamine Synthesis and Metabolism.- Glutathione Transferases and Carcinogenesis.- Natural Environmental Antimutagens.- Introduction: Natural Environmental Antimutagens.- Antioxidants/Antimutagens in Foods.- Role of Enzymes in Antimutagenes is of Human Saliva and Serum.- Isolation and Identification of Higher Plant Agents Active in Antimutagenic Assay Systems: Glycyrrhiza glabra.- Mechanism of Action of Antimutagens and Anticarcinogens.- Interception of Toxic Agents/Mutagens/Carcinogens: Some of Natures Novel Strategies.- Antimutagens and Their Modes of Action.- Avoidance of Errors in Dna.- Introduction: Avoidance of Spontaneously Occurring Errors in DNA.- Introduction: Avoidance of Errors After DNA Damage.- Alkylation and Oxidative Damages to DNA: Constitutive and Inducible Repair Systems.- Molecular Mechanism of Adaptive Response to Alkylating Agents.- Nucleotide Excision Repair Genes from the Yeast Saccharomyces cerevisiae.- The Fixation of Errors.- Introduction: Molecular Basis of Genomic Stability and Change.- Genetic Analyses of the Roles of UmuDC and MucAB in Mutagenesis.- Mechanisms of Spontaneous Mutagenesis: Clues from Altered Mutational Specificity in DNA Repair-Defective Strains.- Genetics and Molecular Biology of Mammalian Cells Part I.- Introduction: Comparative Responses to DNA Damage in Bacteria and Mammalian Cells.- Inducible Cellular Responses to DNA Damage in Mammalian Cells(