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IAA abundance in the wild-type and phyB shoots of 14-d-old seedlings (A) and basal stem segments of mature plants, expressed on a per-weight basis (B) and per 15-mm stem segment (C). Data are means ± se with n = 4. Asterisks indicate a significant difference between the wild type and phyB at α = 0.05. WT, Wild type.
