Editing Redox (section)

===Redox cycling===
Wide varieties of [[aromaticity|aromatic compounds]] are [[enzyme|enzymatically]] reduced to form [[Radical (chemistry)|free radicals]] that contain one more electron than their parent compounds. In general, the electron donor is any of a wide variety of [[flavoenzyme]]s and their [[coenzyme]]s. Once formed, these anion free radicals reduce molecular oxygen to [[superoxide]] and regenerate the unchanged parent compound. The net reaction is the oxidation of the flavoenzyme's coenzymes and the reduction of molecular oxygen to form superoxide. This catalytic behavior has been described as a [[futile cycle]] or redox cycling.