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HU uptake by wild-type and HU-resistant mutants. 11-day-old wild-type and mutant seedlings grown on drug-free medium were moved to plates containing 25 mm HU and incubated for 8 or 24 h before shoots were harvested. After 24 h, the HU concentration in seedling shoots approached that of the medium for both wild-type and HU-resistant plants. HU could not be detected in plants grown on drug-free medium. Error bars indicate ±S.E.
