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Nitrate-specific up-regulation of class III glutaredoxins in Arabidopsis shoots. Transcript abundance of the denoted glutaredoxin genes was measured by real-time RT-PCR in nitrate-treated and ammonium-treated plants. Data points represent means ± se (n = 3). Note that transcript abundance at time 0 h was arbitrarily assigned a value of 1.0, independently for each gene.
