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Lignifying xylem from tobacco (Nicotiana tabacum) expresses oxidase activity capable of oxidizing a range of chromogenic substrates by a non-peroxidative mechanism. These oxidases appear to be ionically bound to the cell wall and can be extracted using 1M NaCl. The extracted oxidases can oxidize the monolignol coniferyl alcohol. Extracts from xylem cell walls contain a number of different oxidase...
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