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Radish root segments cultured with IAA. A, Root segments cultured for 48 h in MS medium containing from left to right, 0, 1, 3, 10, and 30 μm IAA. Scale bar increments indicate 1 mm. B, Root segment cultured for 24 h in MS plus 3 μm IAA and then shifted to MS plus 30 μm IAA for 48 h. Scale bar increments indicate 0.5 mm.
