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Leaf semithin transversal sections ((A,B) hematoxylin–eosin staining; (C,D) TBO staining). Diosmin spherocrystals appeared unstained with hematoxylin–eosin ((A,B) black arrows) but showed typical bright-blue staining of phenolic compounds with TBO ((C,D) red arrows). Scale bars: A = 100 µm; B = 50 µm; C = 100 µm; D = 50 µm.
