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SEM micrographs and Pb localization at transverse sections in root mature zone cells exposed to 50 μmol/L Pb for 24 h. a: Transverse sections of the mature zone (scale bar = 500 μm), b: Epidermal cells (scale bar = 20 μm), c–e: Cortical cells (scale bar = 20 μm), f: Vessel cells (scale bar = 20 μm). *cell wall, cytoplasm, E: epidermis, C: cortex, and V: vascular cylinder
