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Anionic peroxidase activities from poplar (P. trichocarpa Trichobel). Extracts from root bark (1), stem bark (2), leaf (3), root xylem (4), and stem xylem (5) were analyzed on a native gel. Peroxidases were visualized with DAB and H2O2 as described in Methods. The letters a through f were chosen arbitrarily to represent the xylem gel activities. SM, Slow migrating; FM, fast migrating. The protein migration was from − to +.
