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Distribution of 65Zn and 109Cd in the wheat roots 1 d after labelling. The main root and the two newly formed roots were dissected into the root cap, segment 1 (the first segment of 2 mm immediately behind the root cap) to segment 5 (the fifth segment of 2 mm behind the root cap). Means and standard errors of eight replicates are shown for the radionuclide contents (cpm) in the different root parts.
