ContentsI. Introduction 739 A. General Background 739 B. Free Radicals and Single Electron Oxidations 742 C. A Cellular Model 742 D. Peroxidase Oscillator Phenomenology 743 II. Biochemical Model 743 A. Nonenzymatic Oxygen Radical Reactions 745 B. Preliminary Reactions 745 C. Principal Reactions 746 D. Compound III Reactions 747 E. Reactions of NAD • and OH • 747 F. Role of Methylene Blue 748 G. Role of 2,4-Dichlorophenol 748 III. Abstract Models 749 IV. Chemically Realistic Models 749 V. Critical Comments and Connection between Models and Experiments 751 A. Critique of Experiments 751 B. Critique of Theories 753 VI. Future Directions 753 VII. Appendix. Useful Constants for Characterizing Reactants Involved in the Peroxidase−Oxidase Reaction 754 VIII. Acknowledgments 754 IX. References 754

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