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Growth of wild-type PYD and pyd mutant Arabidopsis plants in sterile culture on media containing either no nitrogen (−N), or 1 mm uracil (1 mm Ura). Complete rosettes were harvested after 38 d of growth and the fresh weight was recorded. Values represent the means ± standard error of at least 22 individual seedlings. Significant differences compared with PYD in each group (P < 0.05) using unpaired two-tailed t-tests are marked with an asterisk.
