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ARF2 is a negative regulator of BR responses. Hypocotyl elongation in response to BRZ (A) and BL (B) is shown. Four-day-old dark-grown wild-type (filled bars) and arf2 (open bars) seedlings were grown on plates with different concentrations of BRZ or BL. Results are presented as mean of two independent experiments ± SD (n = 25).
