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Radish root segments cultured in MS medium with 3 μm IAA only for 72 h (A); with 3 μm IAA and 10 μm CuSO4 added simultaneously for 72 h (B); roots incubated first for 24 h with 10 μm CuSO4 and then 3 μm IAA was added for a further 48 h (C).
