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Structural variation in the mature shoot apical meristem. (A–C) Median longitudinal sections of shoot apices from three different 10-year-old plants showing the P1 leaf primordium at different developmental stages. Histological zonation is indicated as follows: the central zone in yellow (CZ); the peripheral zone in green (PZ); the rib meristem-like zone in orange (RZ); the P1 leaf primordia in blue (P1). Scale bars = 100 µm.
