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Relation between the activity of C4H and PAL or COMT activities in transgenic tobacco plants with C4H activity levels modified by expression of an alfalfa C4H transgene. A, C4H and PAL activities in young mature leaves; B, C4H and PAL activities in stems; C, C4H and COMT activities in stems. The lines analyzed were control (●) and C4H antisense or sense-suppressed plants (▪).
