A peroxidase is an enzyme that, as the name suggests, breaks down peroxides.
"Mushroom peroxidase" would be such an enzyme derived from mushrooms.
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Catalase is a member of the peroxidase family.
Catalase generates water and oxygen while peroxidase generates
water and an activated donor molecule. Thus, peroxidase could refer
to more than one enzyme.
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stomach
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Higher temperatures will inactivate peroxidase. The amount of
inactivation is relative to the temperature.