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The rapid growth response in hypocotyls to auxin does not depend on ABP1. Rapid growth responses to IAA and auxin analogs are shown in excised auxin-depleted hypocotyls of abp1-c1 (A–C) and abp1-TD1 (D–F). More explanations are given in the legend to Figure 2. In both abp1 mutants, IAA and 5-F-IAA induce growth, while PEO-IAA is not active. Values are means ± se from n = 8 segments per experiment.
