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Effects of anion (A-9-C or DIDS) and cation (TEA-Cl or BaCl2) channel blockers on the growth rate of maize coleoptile segments incubated in the presence of IAA (10 μm). Auxin was added to the incubation medium at 2 h and channel blockers 3 h later. Curves represent data obtained from the first measuring system. All curves are means of at least eight independent experiments.
