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Auxin maxima in the root apex. (A–D) DR5::GFP maxima in auxin-deficient roots. The DR5::GFP line was grown for 5 d on medium containing auxin biosynthesis inhibitors [10 μM kynurenine (Kyn) and 20 μM yucasin] with or without 10 nM NAA. (E and F) NBD-auxin distribution at the root apex in the DR5::tdTomato-NLS line. The values presented in parentheses indicate the concentration of chemicals (μM). The arrows indicate the QC region.
