Peroxidases are heme-containing enzymes that utilize hydrogen peroxide for oxidizing a vast variety of organic and inorganic compounds. They are found in microbes, plants, and animals and, based on their structural and catalytic properties, are divided into three superfamilies (Welinder 1992). The first superfamily consists of enzymes that are found in animals such as glutathione peroxidase. The second superfamily consists of catalases that are found in animals, plants, fungi, yeast, and bacteria. The third superfamily consists of peroxidases that are found in animals, plants, fungi, yeast, and bacteria (Hiraga et al. 2001). The third superfamily is further divided into three subclasses. Subclass I belongs to intracellular, soluble, or membrane-bound peroxidases. Subclass II peroxidases correspond to extracellular fungal peroxidases, such as white-rot fungi which are involved in lignin degradation. Subclass III contains secreted plant peroxidases (Banci 1997; Fagerstedt et al. 2010).

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