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Scheme of the quinone redox cycling process in P. eryngii (see Discussion for an explanation). (A) Main reactions involved in ROS production through BQ, MBQ, and DBQ redox cycling in the absence and presence of Fe3+-EDTA (solid and dashed arrows, respectively). (B) MD redox cycling, showing hydroquinone propagation by O2−. Reversible reactions are indicated by double arrows.
