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Histochemical analysis of embedded (A) and hand-cut (B and C) sections of kimchi cabbage. General view (A). Ruthenium red (B) strongly stained primary walls; the thick secondary walls did not react (arrows). Hydroxylamine–ferric chloride (C) staining in the primary walls but not in the secondary walls. ab, abaxial epidermis; ad, adaxial epidermis; bs, bundle sheath; pa, parenchyma; ph, phloem; xy, xylem.
