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The relative mRNA abundance of 12 selected HD-ZIP genes was normalized with respect to two reference genes UBQ10 and UKN1 (Populus orthologue of Arabidopsis AT4G33380) in six different tissues. Bars represent standard deviations (SD) of three technical replicates. ST, shoot tips; L, leaves from 4–6 stem internodes; Phl, phloem; DX, differentiating xylem; R, roots; B, bark.
