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Figure 1   Effect of brassinolide (BR) and indole-3-acetic acid (IAA), alone and in combination, on apical hook angle, measured as hook opening, of bean segments in continuous light or darkness for 36 hours. Least significant difference between means (LSD, P = 0.01). (Redrawn from Yopp et al. 1981, with permission for reproduction from Blackwell, Oxford.)

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