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15N enrichment = Heavy/(Heavy + Light) ± se (n = 2 or 3) for the listed amino acids in 80-min intervals. A, 15N enrichment levels of amino acids in plants provided with 15N label at 2.5 h into the light period. B, 15N enrichment levels of amino acids in plants provided with 15N label at 2.5 h into the dark period. Light periods are marked in white and dark periods in gray.
