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Transcriptional regulation of GA metabolism genes by auxin in GA-signaling mutants. Six-day-old wild-type Ler Arabidopsis seedlings and the GA mutants ga1-3 and ga1-3 rga-24 gai-t6 were treated with 50 μm NAA or mock treated for 24 h. mRNA levels were analyzed as explained in the Figure 1 legend. Transcript level in wild-type control sample was set to 1 for each gene, and the levels in all other samples were calculated relative to this value. Error bars represent sd.
