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Principal component analysis (PCA) of the gene expression data carried out on (A) the apical samples and (B) the basal samples. Squares represent the barycenter of the four replicates per copper condition. Represented is the expression profile of 14 cell wall-related genes analyzed on 24 samples each. (Cu1) 3 nM Cu, (Cu2) 30 nM Cu, (Cu3) 300 nM Cu, (Cu4) 1 µM Cu, (Cu5) 3 µM Cu and (Cu6) 10 µM Cu.
