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Stem sections of Olea europaea cultivars Giarraffa (A), Leccino (B), and Maurino (C). ph: phloem, x: xylem vessels; cz: cambial zone; r: parenchyma ray; f: fibers; p: paratracheal parenchyma; bar corresponds to 20 µm. (D) Frequency distributions (number of vessels by 5 µm diameter) of vessel lumen diameters in the three olive cultivars.
