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Unrooted Neighbour-joining tree of NRT2 transporters in Arabidopsis (black), poplar (blue) and 4 grass species: rice (orange), sorghum (green), maize (red) and Brachypodium (purple). Bootstrap values from 1,000 replicates were used to estimate the confidence limits of the nodes. The scale bar represents a 0.08 estimated amino acid substitution per residue.
