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HPLC chromatograms of flavonoid in different samples. The standard mixture of (3) fisetin, (5) daidzein, (7) liquiritigenin, (8) luteolin, (13) naringenin, and (20) formononetin is shown in (A). These flavonoids present in (B) natural heartwood and the (C) H and (D) D zones of a pruned stem are shown.
