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Branched-chain amino acid determination in A. thaliana accession Col-0 of 2- and 4-week-old plants. Amino acid concentrations were determined in leaves of 2- and 4-week-old seedlings. Means ± SE (n = 9–10) are plotted. Asterisks indicate statistically significant differences compared to 2-week-old plants (t-test). ∗∗∗p < 0.001.
