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Protein and low inorganic nitrogen in combination supported better growth of Arabidopsis than protein or low inorganic nitrogen alone. (A) No nitrogen added. (B) Protein only (6 mg BSA per ml). (C) Inorganic nitrogen only (0.04 mg NH4NO3 per ml). (D) Protein plus inorganic nitrogen (5.4 mg BSA per ml and 0.04 mg NH4NO3 per ml).
