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Feeding of (S)-Phe and (R)-Phe (10 mL at 10 mm) to 10 23-d-old de-rooted fodder beet plants via the hypocotyls for 48 h and betalain analysis of hypocotyl extracts by HPLC. A, Control; B, (S)-Phe feeding; C, (R)-Phe feeding. Full scales of A405 = 0.24 absorbance units. Peak numbers correspond to the biosynthetic scheme in Figure 10.
