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Neurotransmitter autoxidation. From left to right. A transition metal (Mn+) catalysed reaction is shown wherein the alpha hydroxyl group of dopamine is oxidised to the semi-quinone radical. The semi-quinone radical then reacts with O2 to generate O2.- and a quinone. O2 can re-oxidise the quinone to quinol to generate H2O2. Transition metals may react with H2O2 to yield indiscriminately reactive .OH.
