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Repeated daily feeding of AIP (16 μm) to hairy root culture of yellow beets between d 4 and 7 and betalain analysis by HPLC at d 8. A, Control; B, AIP feeding. Full scales of A475 = 0.6 absorbance units. The inset in B is the PDA spectrum of the newly formed (S)-Phe-betaxanthin. Peak numbers correspond to the biosynthetic scheme in Figure 10.
