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Cluster Analysis.
Expression of auxin-responsive genes versus auxin levels in the wood-forming tissues of poplar. The auxin-responsive cDNA clones identified by microarray analysis (see Supplemental Data Set 1 online) were clustered according to their expression across the developing wood cells derived from previous expression data (Hertzberg et al., 2001). The red color gradient reflects auxin levels in the boundary between meristematic cells of the cambium and early expanding cells.
