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Distribution of 65Zn, 109Cd, 54Mn, 63Ni and 57Co in young wheat plants 2 d after labelling the main root (autoradiographs). The root tips of plants supplied with 65Zn and 109Cd were strongly labelled (black arrows), whereas no such accumulation was observed in the tips after supplying 54Mn, 63Ni or 57Co (open arrows).
