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Electron micrographs of the root tip cells of control seedlings (A) and plants treated with moderate (B) or high (C) Cd concentrations (85 or 170 μM Cd, respectively). M, mitochondrion; N, nucleus; V, vacuole; ER, endoplasmic reticulum; D, dictyosome; CW, cell wall. Black arrows indicate irregular deposition of callose in the root cells of Cd-treated seedlings. Bar = 500 nm.
