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AU and E of amino acids by alfalfa seedling roots. HPLC analyses quantified the total of 16 amino acids for (A) AU from an initial concentration of 2.5 μm for each and (B) efflux into an amino acid-free mineral solution containing 10 μm CCCP, a protonophore that blocks influx. Data for Phe, one amino acid included in the total, also are shown.
