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Hierarchical cluster analysis of genes found to be significantly up- or downregulated at mid-log phase. Going from left to right, the columns represent the transcriptome change at 1, 3, 5, 7, 9, and 15 min after the addition of ferrous sulfate and at mid-log phase. The intensity of the color is proportional to the change, as represented by the scale at the bottom. Detailed gene names are shown for each cluster.
