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Coexpression-based clustering of Fe-responsive genes. Genes were clustered on the basis of their expression patterns in 300 root-related microarray experiments (for details, see “Materials and Methods”). Similar colors represent genes that were clustered together when a larger set of microarrays was applied. White nodes represent genes for which no overlap was observed, and gray nodes indicate genes that correlate with small (fewer than four genes) clusters in the larger data set.
