Removal of H(2)O(2), oxidation of toxic reductants, biosynthesis and degradation of lignin, suberization, auxin catabolism, response to environmental stresses such as wounding, pathogen attack and oxidative stress. These functions might be dependent on each isozyme/isoform in each plant tissue. Involved in the synthesis of highly polymerized lignins. 2 a phenolic donor + H2O2 = 2 a phenolic radical donor + 2 H2O Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit. Binds 2 calcium ions per subunit. The full glycosylation reduces the affinity of the enzyme for both p-coumaryl and coniferyl, but not sinapyl, alcohol. Expressed in tracheary elements, roots, young and old hypocotyls, and stems in the partially glycosylated form and in roots and young hypocotyls in the fully glycosylated form. None of the isoforms is significantly expressed in leaves or cotyledons. N-glycosylated. Deglycosylated form. Partially glycosylated form. Fully glycosylated form. Belongs to the peroxidase family. Classical plant (class III) peroxidase subfamily. Four genes are encoding the same mature protein that may have different glycosylation degree. The two precursors produced differ by only one amino acid located in the signal peptide.