1.8.1.9 additional information the enzyme utilizes oxygen, requires NADH or NADPH, and readily generates the reduced paraquat radical 674898 1.8.1.9 oxidation - - 1.8.1.9 redox reaction - - 1.8.1.9 reduction - - 1.8.1.9 reduction reduction of the thioredoxin disulfide in two sequential one-electron steps using a [Fe2S2]2+/+ ferredoxin as the electron donor 674172