<P> Hydrogen peroxide in turn may be partially reduced to hydroxyl radical (OH) or fully reduced to water: </P> <Dl> <Dd> H O + e → HO + OH </Dd> <Dd> 2 H + 2 e + H O → 2 H O </Dd> </Dl> <Dd> H O + e → HO + OH </Dd> <Dd> 2 H + 2 e + H O → 2 H O </Dd>

The reduced form of this molecule is critical to reducing reactive oxygen species (ros)