by means of the peroxidation reaction:

:, thus eliminating the poisonous hydrogen peroxide in the process.

This reaction is important in liver and kidney cells, where the peroxisomes detoxify various toxic substances that enter the blood. About 25% of the ethanol that humans consume by drinking alcoholic beverages is oxidized to acetaldehyde in this way. In addition, when excess H₂O₂ accumulates in the cell, catalase converts it to H₂O

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