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RIBOSE PHOSPHATE ISOMERSASE 1 (RPI1) is required for auxin maximum maintenance. (A–G) DR5rev:GFP expression in embryos at early globular, later globular, and heart stages of the wild type (A, C, E) and rpi1 mutant (B, D, F, G). (H–J) DR5rev:GFP expression in roots of 4-day-old wild type (H) and rpi1 (I, J) seedlings. Bars = 10 μm in (A–D) and 20 μm for the rest of the images.
