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A, Representative 20-d-old wild-type (Wt) and transgenic Arabidopsis plants grown in 2 mm Pi. B, Leaf area of transgenics compared with wild type. Although there was a trend for increased growth with increased Pi, the difference was only statistically significant at 2 mm. Data were analyzed for significance in a Student's t test (n = 18; *P < 0.05; error bars = se).
