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A, Stem wood estimated extractive contents in control and transgenic white poplars. dw, Dry weight. B, Ultra-performance liquid chromatography elution profile of extractives isolated from event 712 showing the presence of naringenin (1), dihydrokaempferol (3), and their 7-O-glucosides 2 and 4. C, These extractives are absent in the control event under the conditions employed. D, Flavonoids known to be present in Populus species.
