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Oxidase activity was enriched in extracts of the developing, lignifying xylem of Sitka spruce, Leyland cypress, Lawson cypress and Wych elm obtained by a procedure that selects cell-wall-associated glycoproteins. All of the xylem extracts were able to oxidise the monolignol, coniferyl alcohol, and had a greater affinity for coniferyl alcohol than ABTS. The oxidases were strongly inhibited by Cu-chelators...
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