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Ultrastructure of transverse sections of roots in NAU-XLM under 500 mg/L Pb treatment. Electron-dense particles were localized in IS, intercellular space (A,B); L, lumen (C); SV, small vacuole (D); CW, cell wall (E); Pl, plasmalemma (F); Cy, cytoplasm (G); and E, epidermis (H).
